ROG Swift is TN, which is far from ideal for those of us who do Photoshop/colour sensitive work on our screens. Not to mention the poor viewing angles. It's fine for some, but not for all. IPS, when there's no bleed/glow issues to ruin it, offers a far better all round experience.
I agree though on the negatives of having to choose a 'side' in regards to GPU/monitor tech. That really doesn't help anyone, and in my opinion it should all be cross compatible. Looking at the other side though, Freesync IPS isn't in any better a situation than GSync IPS... seems a sticking point at the moment.