Setting has nothing to do with it. The rules of BitD are built specifically around its intended, limited playstyle. D&D is more "generic" simply because it tries to cover more ground than BitD by a wide margin.
The 5E rules cover more playstyle ground than BitD is all I am saying. That can't be controversial. The whole point of the existence of BitD was do do a single thing really well.
I don't disagree overall (although I think people make too much of 5E being melee focused and "not working" with ranged or guns, but anyway). I just think it is pretty obvious that D&D specifices less about how it is supposed to be played and what that play looks like than BitD. I mean, the...
I think BitD has a significantly more narrow and opinionated design than 5E. I don't think 5E is a generic game, though, just that on the continuum it is more generic than BitD.
Cool.
For anyone (like me) interested, here is a good article on the subject: https://www.science.org/content/article/how-did-ancient-bugs-get-so-big-prevailing-theory-may-be-wrong
Like all great 90s games, it really embraced world building. Those rules were often more complex than they needed to be, but they also had a lot of charm. The math was usually wonky, too. My favorite was Earthdawn.
I walked a player through inputing their character last night (because none of the rest of the group was free). It is a little opaque at times, and not everything is explicit or coded. So take care when building a character and definitely test things before play.
One thing that was new to me but...
I think the most important difference is that with an intentionally generic or universal game, people don't have to tease out the system and eliminate the bits they don't need while replacing them with the ones they do. Instead, all the bits are there and you apply them, turn dials, etc to use...
To answer for myself now that I have a spare minute:
My "perfect session" is probably an in-person (possibly convention) game of either Shadowdark, Daggerheart or Savage Worlds with 4 or 5 players(I have a list but I won't go into it). The actual adventure is off the cuff but built on a solid...