Exactly, not to mention with how beloved the s550 was, if Ford did make a massive change, we all know the same people who are mad ford didn't change it enough would be complaining that ford changed it too much.With Challenger/Charger going full electric, and Camaro potentially just going, I'm just glad there IS a next gen Mustang.
Does it deserve to be called an all new generation? Probably not. For me it's more like the change from 2009-2010/11. Upgrades to engine and chassis, all new panels albeit instantly recognisable as the car that went before.
I suspect marketing wanted to call it a new generation. At least it's not quite as hard to swallow as calling an EV SUV a Mustang........
Previous new generations have had completely different project names, too. Fox, SN95, S197, S550......I think it's telling it only jumped one digit to S650.
But, as I stated at the start, I'm just glad we've got another ICE generation to enjoy, Dodge and GM pony fans aren't quite as lucky as us.