You are confusing game structure with the gameplay itself.

Yes, the structure has been changed on every game since the original trilogy (i wouldnt say Sonic CD though. That is pretty much the same with the added time travel mechanic wich just adds more levels of the same).

The gameplay itself is the way in wich you control Sonic and he moves around. 2D Sonic was already optimised by Sonic 2 and Sonic 3 just perfected it even more. Sonic adventure 2 was a perfection of the Sonic adventure one controls/gameplays (i'm talking about the speed levels. The other types shouldnt even be there in the first place, and i totally agree with you on that).

There is no blinding bias here. These changes are what has made Sonic bad. There is no core to fall back on and from where to expand like there is in Mario. The core gameplay of a Sonic game is not set because its constantly changing. I totally disagree with you though, i think modern Sonic's gameplay only appealed to a fraction of players because its just way too fast. There is no control and you just change lanes for the most part. There is no platformer game in those. Its an on-rails game. Yes, i know they mixed in a few pieces of 2D. But that should be the focus and not the "mix-in". It was a complete cop-out cause it excused them to perfect the system from Sonic adventure 2 (again i am talking about the Sonic levels). And Sonic 06 tried to do that but was simply rushed out before it got polished.

But SA2 was garbage, too. Especially the Sonic levels. It blows my mind how people still defend that game. Its Sonic 06/Boom bad, if not worse. It's been years, guys. It's alright to admit it was bad, now.

The reason Sega keeps reinventing the wheel is because they never invented the wheel in the first place. They drew the wheel perfectly in 2D on sketch paper a few times, then fucked up every attempt to make even a mediocre wheel in 3D. The only one that approached mediocrity was Lost World. At least that game had alright controls. Everything else was poor (Unleashed, Colors, Generations) to absolute abominations (SA1, SA2, Heroes, 06, Boom, everything else.)

You are confusing game structure with the gameplay itself.

Yes, the structure has been changed on every game since the original trilogy (i wouldnt say Sonic CD though. That is pretty much the same with the added time travel mechanic wich just adds more levels of the same).

The gameplay itself is the way in wich you control Sonic and he moves around. 2D Sonic was already optimised by Sonic 2 and Sonic 3 just perfected it even more. Sonic adventure 2 was a perfection of the Sonic adventure one controls/gameplays (i'm talking about the speed levels. The other types shouldnt even be there in the first place, and i totally agree with you on that).

There is no blinding bias here. These changes are what has made Sonic bad. There is no core to fall back on and from where to expand like there is in Mario. The core gameplay of a Sonic game is not set because its constantly changing. I totally disagree with you though, i think modern Sonic's gameplay only appealed to a fraction of players because its just way too fast. There is no control and you just change lanes for the most part. There is no platformer game in those. Its an on-rails game. Yes, i know they mixed in a few pieces of 2D. But that should be the focus and not the "mix-in". It was a complete cop-out cause it excused them to perfect the system from Sonic adventure 2 (again i am talking about the Sonic levels). And Sonic 06 tried to do that but was simply rushed out before it got polished.

Of course there is a bias. You have made it quite clear you prefer the Adventure era Sonic, fine, but you constantly put it on pedal while ignoring the fact nearly all Sonic's problems started there or in the case of re iventing wheel, before.  

Your second paragraph agrees with with what I said. When I said Boost to Win has life I means ways they could advance it. They Hadn't hit a brick. Im not a fan of Boost to win but there was alot of room to make it better.  

Sonic's problems have always been his problem. It didnt start with New Sonic Team, or Naka leaving ext. Thats the main point Im making. Lets not pretend adventure ara was the exception. 

That isnt the case at all. I am splitting 2D and 3D.

If your point is: Stick to 2D. I'm ok with that. But if they want to go 3D, i'm saying what i think worked best.

The adventures were not perfect at all. But the speed stages were moving in the right direction. I want a full Sonic game with that gameplay.

Nope. You are judging it from today's standards, not the time when it launched.  And again, i am talking about the speed stages, not the whole game. And Sonic 06 is an incomplete game. Its unfair to be saying its bad when it wasnt even done. Everything was broken. The hype for it was real though. Its why it ended up selling loads regardless.

They did not perfect what they had with the sonic gameplay on SA2, so obviously it did not move to the levels where its perfected by today's standards.

I will agree that the 2D wheel was perfectly drawn though.

Generations is anniversary game not a series. Unleashed is Rush 3