Be very careful when window shopping for modules on Youtube.
The biggest mistake people make is not understand how many additional modules are required in order to get "that sound" out of the module(s) being featured. You'll often see someone reviewing or demoing a module with that module focused in the shot. But the rest of the kit and cables are off screen. Often the featured module is doing the least amount of the "work" going into that sound.
As far as the kit mentioned in the OP. The Plaits module and much of the Mutable stuff does not need a VCA in order to create a volume envelope for itself. It has its own built-in envelope should you choose to use it. Braids and Plaits are a staple of module because they are great for self-contained sounds that don't require additional modules to tease out. So while it's possible to get away with not having VCAs, you're leaving the best part of modular synthesis in the synth shop.