Huh? I did play the Dreamcast version when it came out. It's my favorite game and I never owned the Gamecube version, I just play the Dreamcast one all the time. I have never heard of, much less actually experienced, the final stage being broken. Sega knew full well that despite the Dreamcast having DLC capabilities, a huge part of the audience of the late '90s/early 2000s wouldn't have access to it. The DLC the game has is cool, but I never bothered with it until years later because I was one of those people who couldn't use the DC online.
Yeah a lot of them are. Like getting characters into levels they're not supposed to get into in Sonic Adventure 1. The glitches aren't game breaking, they're the type of shit that takes effort to do but is cool to fuck around with.
Knuckles' is the one that's hard as balls, at least if you don't have the item that lets you breathe underwater. Get that and the whole stage is pretty easy.
You make legitimate points, but despite the lack of Adventure Fields (nobody ever really acknowledges just how detailed the NPCs' stories are), which I think is the biggest thing I miss from SA1, the level designs are just so vastly improved in SA2 that it makes up for it. When I want to play SA1, I go through the story mode and that's that. It's fun for a few hours, but the extra content isn't really worth bothering with. When I play SA2, I want to master all the levels, because they're much more intricate, and the scoring system, ranking system, and unlockables, give you much more incentive to come back. It results in the game having a lot more content and replayability.
You say that as if it's a good thing. Heroes is okay, but Advance influence in the main games is what eventually lead to the boost to win formula we get now.
But without Big.
Too little, too late. Also, no VMU support.
Also, I forget, but is the Dreamcast DLC available on any of the other versions? I don't think you can play as Eggrobo in any of the other ones, can you?