I prefer it for synths that are very modular like these. There are other synths with just as deep a modulation capabilities and capabilities to route inputs and

I prefer it for synths that are very modular like these. There are other synths with just as deep a modulation capabilities and capabilities to route inputs and outputs and create feedback loops, etc. But the jumbled mess of cables is easier to follow than a big table of dropdowns, or a massive N x N matrix, or dynamic labels that appear over controls being modulated. But also part of the whole thing with modular synthesizers is you use whatever modules you want. As few as you want, or as many as your CPU can handle (or more if you're willing to ditch realtime). So you would need a UI paradigm that can work for 2 modules with a couple inputs and outputs each, but also with a massive rack of hundreds of modules with up to dozen of inputs and outputs each. Do I want my fifth VCO to plug into input 3 of my fourth VCA? I'd rather just follow a cable visually. Some synths do have a great UI that works for them. Razor and the original Massive are still among my favorite UI's for usability. But they're also more limited in their scope. (Yeah Massive is a really complex synth and could be your only synth for life, but true modular emulation style synths have an infinitely higher ceiling of possibilities).