Editing this out completely because I'm still being quoted despite my clarification on what I meant:
That's not true. G-Sync is compatible with IPS, it's just we haven't seen any G-Sync IPS displays. Tom Petersen from NVIDIA confirmed this.
The point is there's no need to aim for the two extremes from a game development perspective (on a fixed console platform). A game running at an average of 45fps would be better than a game running at 30fps but not as good as a game running at 80fps.
The debate has two definite sides because you're forced to pick one if you want a decent experience by hitting that (fixed) refresh sync. That would no longer be the case with adaptive refresh. You get a tear-free, stutter free (of refresh related stutters) image at any frame rate above that minimum. That should give a decent amount more freedom for developers and their prioritisation of resources.
I don't really care about what people argue about on forums, that's not my point. I'm talking about the internal debate that many developers will have.
GSync is currently not compatible with any IPS display, so no sadly.
That's not true. G-Sync is compatible with IPS, it's just we haven't seen any G-Sync IPS displays. Tom Petersen from NVIDIA confirmed this.