I also had a look at this, and right off the bat, several problems were apparent. One that really typifies the issues here is the placement of those Erica PICO VCOs. OK...so, two 3 hp modules, itsy-bitsy knobs, very closely spaced and on the same "plane". So...let's say you're playing live, and the first VCO gets a bit out of tune. So you quickly grab that and try and adjust the tuning on the first one...but you snag the SECOND one with the topside of one of your fingers and knock THAT out of tune as well. Now BOTH VCOs are knocked out of whack, and things start to get...not good. But because of the tightness of the control surface here, frenetic attempts to correct matters results in even more ugliness, then someone in the crowd gets riled up and chucks a bottle at your head. You wake up in the ER a couple of hours later with a concussion, then a nurse brings in the remnants of your modular in a trashbag after the incensed crowd has exacted its revenge on the hapless machine.
OK, so that's a BIT of an extreme example...but it does point out that you not only need to be considering WHAT goes into a modular, but HOW it goes in as well. If you have controls that require careful adjustment, it's ALSO important that you include the right amount of hand clearance between everything. And this has a number of points where a slip of a finger can lead to pointless difficulties...all avoidable by just being careful about layout and ergonomics. This doesn't merely apply to synthesizers, but ALL musical instruments...and mistakes about the "playability factors" invariably leads to abandoned instruments.
Case in point - this is a picture of a trumpet: https://cdn.shopify.com/s/files/1/2527/5506/products/1_0e2f3975-7e1c-4873-a1bd-fc164a08760d_1024x1024.jpg?v=1513160452
And this is ALSO a picture of a trumpet: https://benneill.com/wp-content/uploads/2019/07/IMG_6691-1024x669.jpg However, unless you happen to be Ben Neill, you're going to have a lot of trouble with the second trumpet if you're used to the FIRST one. The vast majority of trumpet players would find Neill's Mutantrumpet massively confusing...which is why you don't see very many trumpet players sporting horns with three bells, Rubik's-cube-style switches and knobs, and two-plus sets of valves.