well i just tested the usage of UDIM's and i have some concerns about it, first i thought that working with UDIM textures would give a single tiled image of all the textures or something, but all i got were a pack of texture sets per UV tile that i made in substance painter, my question is:
How is it any different of the method of multi material objects assigned to each poly, then exported to substance painter and exported as different sets of textures?
i end up with the same, an object with different assignments and 6 packs of textures, working with UDIM's only saves you to create materials
it seems like the UDIM workflow is so much better than the old one but i see no difference at all...
Hope you can understand what i mean