If there’s one thing that Muppet fans agree on, it’s that there are variations to Kermit’s behavior/personality. Many see the differences as a negative and attribute them to the change(s) in performer. Both Steve Whitmire and the writers are frequent targets of this criticism, with fans on forums claiming that the writers and Steve alike have been too “precious” about Kermit, resulting in Kermit’s having become too soft, too bland, or too nice. I understand what they mean, and I understand that “precious” is meant to be a pejorative in this case, but personally, I think that being “too precious” with Kermit and the other Muppets is vastly preferable than treating them like old socks that can be tossed around willy-nilly, as Disney is doing now.*
However, I get the impression (and this is pure conjecture on my part) that Steve had been hearing criticisms in this vein for years and years. No more than one day before Cheryl Henson infamously weaponized the criticisms against him in a Facebook post (which, in her defense, was apparently intended to be private), he made the following statement in a blog entry: “[T]here is actually no such thing as Jim’s Kermit and Steve’s Kermit – There is only Kermit.”
In my opinion, the whole issue is a lot more complex than anyone, perhaps even Steve, is willing and/or able to fully acknowledge.