I don’t think Epic Games is going to make support for stylized rendering better any time soon. It’s looking like they’ll make it worse with each iteration.
The amount of work that Arc System Works put in to customizing and describing their stylized techniques for Guilty Gear Xrd back in 2013 for UE3 haven’t lead to much changes to UE itself. That development pretty much fell on deaf ears, or rather, because UE customization is hard enough, nobody else replicated what Arc System Works did in Production, so you don’t see a lot of highly-stylized/anime-style games/entertainment made with UE.