Recently I´ve used them as gloss, specular, roughtness and metalness maps too in Marmoset Toolbag despite being limited in texture options and absence of nodes. The results are not so bad for my taste, here is a demo of how easy is in Marmoset Toolbag 3: And that´s how I made this promotional GIF: In this case, the pack…
I´ve spent several months working on this so I will say that this was my quarantine project instead of some 3d work. For years I´ve seen a lot of people selling and or using 4k or even 8k textures, more related to workflows that involve the final rendering in Vray, Arnold, Octane... Maybe I´m the only one who still no uses…