Another nice part of Sonic Generations is the ability to play through Unleashed as Metal Sonic.
I just ignore that the Final Boss even exists. The game ends after Egg Dragoon.
Metal Sonic and Chaos were fun fights. Especially Chaos, since they basically recreated the original fight.
I don't know either. Especially since, for Metal Sonic, Shadow and Silver, they had the assets already made for three potential full DLC stages.
Stardust Speedway (Bad Future)
Space Gadget
Crisis City (Alternate)
Modders also had a 100% full working Metal Sonic mod out within a year or so, so I imagine a real dev team could have pumped that out faster. Along with Tails, Shadow, Knuckles, Blaze and Silver, who also all have assets already in the game.
And whatever engine they working on seems easy to transfer work, because folks got shadow in lost world to a somewhat workable state with his unique animations within i believe it was a week.
Sega will complain about how sonic stages cost money and then dont do things, some of those things requiring minimum effort, that would make them money.
Like seriously.