For a turret prop for games 6 or 7 UDIMs sounds like way too many. This depends on the resolution of each UDIM of course, but as @Joopson mentions throwing more resolution/UDIMs at it is probably not a reasonable way to solve it. In production, you will have a resolution limit that you will need to stay at/under, so making…
For.. > a turret hero prop ..this might be overkill. For some VFX in a movie you might even need more. So this all depends on your use case and the needed pixel density. I guess the turret will not be used for a "portray" shot but "somewhere on the screen" in a game ?? Again: You may have to elaborate this to get a more…
TBF, textures on your disk (10 textures of 4k tga -> 420mb) is not the the same amount of resources as it would be in build (far less once converted to DXT/BC7 and compressed into build), but your point is valid nonetheless that this is more of a matter of being pretty reckless with your texture sets