There is also a plugin for Fusion 360 which allows customizing a lot of items that can go into the grid.
I do work on my shop, but only so far as it furthers my hobbies.
As far as gridfinity goes, it's really nice to have the right size and amount of storage for everything. Imagine those inserts people buy for cutlery for a drawer in the kitchen. There is always a gap on the side for something to fall into. There is only a slot for all knives. No place at all for corn on the cob holders.
Now imagine this same problem for building models where a person may have 200+ different items in different amounts. Previously people used things like tackle boxes from fishing, or one of those plastic cases for holding screws. But they never quite line up.
Also, 3d printing is very much an asynchronous kind of thing. You work on your shop by pushing a button and get results an hour later. It's not woodworking where you spend 80 hours building your bench, then the next 500 hours building all the parts for it.
Making a custom enclosure for every tool seems over optimized and wasteful. If I were to attempt this, it would take decades and I'd never see a return on productivity within my lifetime.
Also seems like a great way to add +50% plastic volume to everything you own. Incidentally, I've found the cardboard boxes that 3D printer filament comes in to be an excellent basis for general storage.