There are any number of people out there who could do a Kermit voice we're less likely to be distracted by, but they refuse to recast with outsiders because, I dunno, something about the camaraderie of the team I guess. This worked well the first few times they lost members (especially Frank Oz), but only by pure luck. The other valid reason they have to keep doing it this way is that it's one thing to be able to do voices, but they need people who are skilled and proven puppeteers as well.
Which brings me to my next point, which is that for the first time I can remember, the puppeteering felt rough in spots as well. The worst was Gonzo's stunt because they insisted on using the animatronic for closeups instead of swapping him out for a real puppet, but there were subtler moments of jankiness I'd have to go back and rewatch to pinpoint.
Incidentally, I recently scored a 3-season set of the original Muppet Show on DVD and I've been watching through those, and it struck me that a lot of the comedy falls flat compared to most of their movies. There are a number of possible reasons why this might be, and it's probably a combination of all of them: comedy ages poorly in general (I had a similar reaction to seeing Airplane the first time), slapstick is tougher to pull off with puppets (especially to a generation spoiled by cartoons with their physically impossible movement and frame-perfect timing), the writers were still finding their feet and needing to squeeze out a whole season's worth of material in a year compared to multiple years for one 90 minute film, limited time available for retakes... And that was when they were at least trying; owing to its variety-show format, often they would have a whole segment where they'd just let their guest star or even the Electric Mayhem perform with no gags at all.
It's been said before on this forum that one of the biggest things an attempt to revive The Muppet Show would have working against it is that variety shows are long dead. And vaudeville, which they specifically chose to pattern the original show after, is so far past dead that so is every person old enough to have ever seen it. Muppets Tonight dealt with this by tweaking the format just enough to more closely resemble Saturday Night Live, which was at least still relevant back then. To now dial that back feels like a sign that they don't know what they're doing, how to market the Muppets to anyone younger than literal boomers.
And, yeah, this mostly felt like a new episode of the 1970s Muppet Show. It feels like the product of writers who managed to internalize its style of humor despite growing up a generation or more later, and faithfully spat out more of the same. If they continue to air this on ABC rather than make it a Disney+ exclusive, I'll continue to watch to see if just to see where it goes. But I'm hoping it goes somewhere interesting, or I won't be surprised to see it go away.