For example, I personally couldn't work in a shop where all the tools were stored out of view and hidden away. The monolithic systainer wall is not my thing I guess.
I will agree with that 100%. Everything should be within quick and easy access and set up as much as possible. My friendly cabinet makers have 6+ routers. They are plugged in sitting on a shelf and ready to go.
On the other hand if you are mobile IE: remodeling, new construction, etc, having Systainer's is awesome! Although I actually prefer the size of the Ridgid boxes. I jam as much as I can into each Systainer/box. Less boxes is better under all circumstances. Wheels are a must.
I prefer to move 100+lbs in one shot on wheels. Although some tools deserve protection and I count my track saw as one of them. On the other hand most of my cordless stuff is packed into a Ridgid box.
One thing I do have a lot of is bins, as in the ones from Costco. The clear ones are nice but the black with yellow tops are bigger. I think I am up to about 70 bins for entire home organization. All my drywall stuff is in one bin, another has tiling, another...you get the picture. I have a folding 200lb dolly that moves the bins around as needed.
Depending on how many Festool Systainer's you have, getting a Sys-roll might just be the solution for mobility.
Check out the Husky and Ridgid stuff at Home Depot.
FWIW someone on here put wheels on their MFT.