I've seen complaints about Steve's Kermit and the other Muppets "sounding wrong" too (I recall there being a review of the 2015 show on IMDB that complained about Bunsen's voice, even though it's still Dave Goelz!). I've said this before, but I think most people only complain about the Muppets' voices because of that
Family Guy sketch
@Cmdr_Crimson posted... like, after they saw that, they all went "Oh, yeah! That's another thing we can complain about!". Even if it they had Peter Linz take over as Kermit like everyone's been suggesting, there'd probably still be complaints about Kermit's voice.