Yeah why not?
Because whenever I download an image and its webp, the next thing i do is i google "webp to png/jpg" conversation because yeah service XY or Tool Z doesn't support it.
Or my Fire TV Stick :(
I configure my nginx to serve everything available though. Thats what i can do.
[dead]
You can throw almost any image format with open standards into squoosh.app if you're still using software that doesn't open webp.
It's been a while since Photoshop finally got support, though, I can't recall the last time webp posed a problem for me. Then again I don't use a Firestick, no idea how that would deal with image formats, I guess it's no longer being maintained?