@Götz
It looks like my posts are being delayed. I am just learning the ways of the forum, and how to phrase my posts wisely.
40 millions is indeed what I meant for Solid Mesh display.
The Texture touch-ups are a key step as no environment is ever captured in its entirety (occlusion).I often have to remove objects, fix floors, or simply fill in areas with missing textures or slight misalignment, but still stick to RC and avoid manual unwraps for 99% of the work.
I then export models as UDIM and paint textures in 3D instead of 2D and do not worry about seams. For any ad-hoc work I just detach small areas of the models and unwrap separately into a single additional 8k that can be easily managed in 2D (sometimes you can simply add to an existing tile)
This of course requires a bit of planning around mesh creation and splitting environments into multiple models (eg. rooms) so as to keep a manageable per-obj texture count.
I think RC unwraps are actually quite good, and surpassed only by…(same tool mentioned earlier) with some limitations. Texture utilization averaging around 75% is quite amazing for the time required. I need dozens of maps to meet resolution requirements, and Utilization is the most important thing in the end.
More custom Unwrap options would be great though (eg. ability to paint/preserve seams or groups of faces without having to separate geometry.
What is your workflow for dealing with UVs, and touch-ups?