Official 
post (which disavows Roger Craig Smith)
Seriously why. Sonic and the Black Knight was the last one and it was also the last time you could beat the final boss to a kickaas buttrock theme song. Why don't we have this anymore?
I really want Frontiers to be a full return to form for Sonic but I'm tryna keep my expectations way down.
And here's where I learn that Un-gravitify is 19 years old
The spinoff games sometimes have chill themes, Free from Sonic Free Riders is okay too.