There's a collab video between Antdude and Caddicarus that explains it pretty well:
https://www.youtube.com/watch?v=hRwAQWGRpaY
Essentially, because apparently a lot of Japanese gamers were getting motion sick? from 3D gaming, they changed the camera and some of Spyro's moves, but these changes resulted in Spyro's gameplay flowing less well, a lot of instances of the camera actually being irritating due to stuff you can't see well, and the game was just less fun overall.