Fair points, although Carnival Row is still a pretty good example. Granted neither of the two leads have such requirements (just wings and flight), but some of the supporting characters do. But, as you said, it's all academic until we know how the show is going to be structured.
As you say, in that example the people looking creature designs are still mostly played by actual people in heavy prosthetics. Additions like wings and flight are a relatively simple matter of compositing. All of the 100% CG creatures are by design inhuman looking enough that the uncanny valley isn't a concern. See also: talking polar bears, creepy monkeys, shape-shifting animal-demon things etc...
All very skilfully done of course, but the issue isn't the fidelity of the VFX as a whole, but the technical complexities of the very tricky effect in question: a human looking full CG body replacement that can emote from performance capture and read as photo-real in the same frame as actual people.
Doable, of course, but involved and expensive even for a big budget movie, let alone a TV show, even a lavishly budgeted one. Even the Professor Hulk effect doesn't quite get there. It avoid the uncanny valley sure, but you can 100% tell it's CG and there's no mistaking him for a large person in green make-up. And that is literally bet best money can buy right now for ANY production.
They might be able to *just* get away with a digital double in masters or wide shots, but mediums and singles would be VERY labour intensive.
Bottom line: I suspect they'll be best served just avoiding going full She-Hulk as much as possible.