Portability is definitely a factor for me. So everything is in cases. But I have two monorocket 104x cases, at 12u each.
And when I bought my first module, I was convinced that all I needed was the 3u skiff.
Of course it all depends on the individual and our objectives in relation to our means. My point was that, in my opinion, the ethos of modular is that it thrives in that network mentality. Sometimes I find great pleasure and fulfillment in meaningfully interconnecting only 3 or 4 modules. But most of the time, reaching for complexity and nuance takes the entire two cases. This, in my case () is the result of the fact that I think of my modular as a complete environment/instrument. So, not just generating sounds, but also constructing structures and patterns, and at the same time "performing" these structures with an element of organic (generative?) sensibility. That (most of the time) takes exponentially more modules to execute.
In that scheme, I see my role as someone who builds, destroys and re-builds that network continuously, and overseeing/maintaining the dynamic of it's functioning on an "as needed" basis.