I think the real test of a system is what happens when you're tired
A system can look brilliant when you're motivated. Everything has a category, every project is perfectly labeled and the dashboard looks great. Then you're tired on Tuesday night and suddenly you can't remember where anything goes and that's when I think you find out whether the system actually works.
I've started asking: could I use this without thinking very hard?
If the answer is no, I'm trying to simplify rather than add another layer. The best systems I've had aren't the most sophisticated ones but the ones that still work when I don't feel like managing them.