What kind of hd pbr material pack are you looking for?

I have a lot of experience in creating AAA games and looking to create a texture/material pack to release in the marketplace.
I want to release a super high quality pack that can benefit lot of people. ( maybe even substances that can be tweaked to get many results,)

Please let me know what kind of texture pack you find is lacking in the market place or even if it exists but quality can be improved on.