I'll be honest - he seems to be a prime example of someone focusing too much on the tools rather than the creative process. All his best, legendary, stuff came way before he got this awesome setup, his recent stuff hasn't been very well received. You don't need a ton of expensive equipment to create excellent electronic music.
The modern musical instrument is a diaphragm controlled by a stream of real valued position samples. There's absolutely no need for anything complex to play it, you can write simple C programs to generate all kinds of bizarre and beautiful effects.
I really believe that there are sounds that are achievable most easily with a modular system. One example that springs to mind: the west-coast school of additive analog synthesis often uses circuits classified as low-pass gates (more or less combining the low-pass filters and voltage-controlled amplifiers of east-coast subtractive synthesis). SuperCollider is one of the most actively-developed systems for experimental audio synthesis, and the only plugin emulating low-pass gates I’ve found is in one of the SuperCollider developers’ personal sandbox repo. A google search indicates that apparently someone has written a PureData low-pass gate emulator, but I can’t speak to its quality. My point is, not everyone who wants to try to make music in one of these systems is going to want to write their own C++ or FAUST plugins, or compile a buggy early version of a plugin. So it seems to me that if you want to just make the sound, a eurorack modular system might be the most accessible way to do so.
And I also think the music people make using modular systems is ideally consumed in a manner very different from, say, EDM tracks on soundcloud or spotify. If you are in the bay area, I highly recommend attending Robotspeak’s regular Church of the Super-Serge concerts to get a sense of this (one performance I enjoyed a lot: https://www.youtube.com/watch?v=d8Xn6IbItT8). Members of the eurorack synthesizers group on facebook are also constantly posting little snippets of modular music. This stuff isn’t for anyone, but it is certainly interesting. Patches people create on modular systems are ephemeral and meditative, so they're often described as sand mandalas. The user explores the capability of their collection of modules, they find an appealing or interesting sound, and develop some minimal accompaniment around that sound. The graph of possible connections in an even medium-sized eurorack system is quite large, and there are many manual controls on each module (at minimum 3-4). “Saving” a patch involves painstakingly recording each knob setting and patch connection. Re-creating a patch exactly is therefore quite challenging. So people leave their system patched, come to the show, and perform a single 10-20 minute long composition. That’s the set. Very idiosyncratic, hit-or-miss, but usually interesting, at least. I hope this conveys some of the unique appeal of putting together a large modular systems.