I'm not convinced you do see...

synthesis with modules, as opposed to modular synthesis

not just utilities, although they are a big part, but also basic building block modules... a simple analogue vco etc etc

but yeah could do with load of utilities - everything from switches (manual and sequential) to matrix mixers, to attenuvereters,,, and everything in between - but which and how many of these you need is up to you - once you start with patching some in you might not be able to stop...

"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