Shadowdark captures the original D&D aesthetic just like how the original Traveller Book captured the 2d6 science fiction spark of imagination. Do these self-contained tomes have every option, provide the most detailed combat systems, or give your billions of combinations of options?
No.
Doing any of those things would ruin what these games are, and the possibilities they offer.
Forget today's encyclopedic games which are shelf fodder for the collector's market, and not games which can be easily played with others. The best game is one small rulebook and infinite possibilities. Very few games capture this. Even the new Traveller has dipped into the collector's market a bit too deeply, and that game is a hard sell for me to anyone interested in science fiction.
With D&D, you are talking nearly $200 in books to get started, a subscription service, reading hundreds of pages of rules and options, learning a VTT, and becoming familiar with action types, turns, and all sorts of special conditions, spells, powers, and abilities. The D&D Starter Set is probably the best edition of the game, and you should ignore the rest. Very few people play past the levels given in the Starter Set, and the game at high levels is horribly broken.
Just selling someone on "hey, play this with me!" is an impossible task unless they are already deeply invested in the D&D market. Most average people, when I go up to them and offer to play a RPG with them?
Forget it. D&D is too big to even suggest. Too big of a cost, time investment, purchase, reading requirement, and commitment for any average person to make. I bring D&D up to people outside the gaming market, and I get blank stares and a feeling I should "go play with people who already know the game." D&D as "social glue" only works on those already sold on the game.
Shadowdark is different. I can start up a Shadowdark game with those outside the D&D sphere, they say "what is this" and they see how easy it is, and they are instantly interested and know "I can have fun playing this!" Me, as someone who runs the game, has a "social value" to others as a "person who plays a fun game."
And I can get anyone playing the "full version" of Shadowdark with just the Starter Set, and me owning a book. The character sheets are so simple, and what you need to read and learn can be easily passed on in one minute of showing someone how things work. The game plays like the classic Hero Quest or Dungeon boardgames, where it is just "move your piece and do something" every turn.
Shadowdark is this generation's "Basic D&D." This is the game Wizards should be selling for the hobby, and D&D has turned into a grognard-like mess of rules, options, special actions, bloated options, and an almost "Advanced Squad Leader" feeling to the entire heavy and book-heavy framework.
I can't sell people on D&D anymore.
The 2014 books were an easier sell, honestly.
These days? It is a non-starter with thousands of backward-compatible options confusing the market, and the game depending on online character creation tools. I have to sell people on a game, time commitment, huge purchase, website, subscription service, microtransactions, and a huge buy-in to get started. There is even a social commitment (orcs, drow, half-races) you need to make to align yourself with the designer's vision of the game that feels like it overreaches into your imagination.
Shadowdark is my "social glue" for fantasy these days. I can play it with someone in a heartbeat, introduce it in a minute, show them a zero-cost point of entry, and get them in game with me without them needing to buy a book or sign up for a subscription service. Sorry, Wizards, I am not selling D&D Beyond to other people to play games with me. I am not doing your sales pitches anymore.
Shadowdark works because everything is kept dirt simple.
And once people play, they are hooked, and can join in the fun for free.
I tried putting Shadowdark in storage many times and walking away from the game. To me, it was too simple and did not fill my grognard need of rules, realism, and options. I loved the respect it paid to the classic hobby, and the art and how the game is designed pays a lot of respect to the old ways. I loved the presentation, but felt the game was too simple to hold my interest.
To be honest, I feel Dragonbane fits in this equation somewhere, as the power-fantasy game many play alongside Shadowdark. Where in Shadowdark you need to play carefully, Dragonbane feels like the "charge in, slashing swords and casting spells" style of fantasy many prefer (minus the D&D commitment and bulk).
But every time I gave Shadowdark a chance with others, outside the hobby, I made new friends who were interested. I know, after a while, someone will try to sell them on D&D, but they will likely end up disappointed and leaving the hobby because for them, D&D is too big to play. D&D is the wrong game for them. They will get in, make the purchases, and feel ripped off because they don't have the time in their lives to get involved with a hobby that demands a majority of your time and attention.
Shadowdark?
I can pick this game up and put it down like a boxed set of Monopoly. For others, that is the same level of understanding and commitment they need to invest. Want to play Shadowdark? Yes! Cool! And there we are, zero time and prep needed, hand out a few simple character sheets, and we are playing a game together.
The "social glue" of Shadowdark works, and it works well.