I’ve thought of the same question “do all modules need to be on the same power supply”.. but more from an electronics POV.
I have 2 cases that use multiple power supplies - never had a problem...
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities