And by "platforming segment" they probably mean waiting for a platform to slowly make its way towards another playable part of the map and that's why you tell them to stay away from Sonic 1 (Genesis) post Green Hill Zone or CD. Sonic 2, 3, Advance 1/2 and the 3D Games before Shadow do a decent job at maintaining both.
I think the biggest problem is that this series is primarily looked as "gotta go fast" because of their initial marketing. At their very core though, they were clearly designed as an explorative venture through sandbox-like levels with multiple paths and collectibles (that's why having Tails and Knuckles playable adds so much to the series). People need to remove this "gotta go fast, screw the furry friends Sonic-only" mindset because in the end all that's really going to do is relegate the games and development to purely automated spectacle with little input or interesting mechanics on the player's end... oh wait that's right, it's already happened fml.