My biggest problem with the otherwise great Substance Source Material Library is that the scope of the textures, the area they cover is very small, usually in 1×1 to 2×2 meters. There is no support in Substance to increase the scope of materials so if I wanted to avoid excessive tiling on even moderately scaled surfaces then I pretty much had to redo the material from scratch. The issue also crops up with photogrammetry where sometimes a wider shot of a surface is impossible to obtain.