A YouTube video will not tell you about its strengths and limitations; it will only show you what one person has learned to do with it. A system isn’t inherently good or bad in absolute terms, but rather in terms of what it can provide you. I can talk about the modules a little.
Chords (module) is interesting if you feel you must have chords (musically) but that power comes at the expense of some flexibility in the voice. You’ll also need to play it live or have at least 2 channels of CV to control it (chord type and root note). Playing it through one of the optomix channels should probably provide what you expect: a 4 oscillator paraphonic chordal voice. This isn’t something that fits my use case but you might like it.
LPGs like those in optomix and elsewhere can seem appealing as a “VCA and VCF + Envelope” but they aren’t as flexible as having all 3 of those things piece meal. They provide a certain shape and sound which can be appealing but I probably wouldn’t want them to be my only way to envelope voices (having said that I personally like optomix).
Basimilus iteritas is a very interesting voice, but in this context I think you’ll want to control it in various ways of which you might not have enough. I’m sure you can have fun with it, but more modulation sources or sequencing will probably help get the best of it: an interesting and distinctive module that probably needs more support to shine.
Maths and X Pan are both interesting and flexible modules that can do quite a lot of things so they may make sense, irrespective of the rest of the system, though they are both quite opinionated meaning you’ll have to enjoy and embrace their quirks and features to get the best out of them. The 0 Coast and 0 Ctrl make an interesting duo and are quite featureful but how that integrates into the latter system depends on how you work with it. Similarly the sound and style has to sit where you want.
On the whole I’d say this system is getting more coherent, but for me, I’d want some more rhythm and CV generators or sequencers, more modulation sources, more VCAs and probably a filter. In the end you won’t know how it works for you until you have it in front of you. After a while of use, you’ll know what to add, remove or change. If you start out with only the 0-Coast first, learn it, then add the 0-Ctrl and learn the duo you’ll probably understand what makes sense for you. A few months of that and you’ll have a much better idea of what to put in a rack to build it out.