I mean one reason is, when they’re communal, they treat them like shit. I know someone who works in a shop and the communal tools are a disaster, shitty assortment of random tools. Whereas they take pride in their own cabinets and try not to lose shit, keep it organized and stuff.

This doesn't happen in my experience (in a machine shop). Sometimes things get broken or misplaced for extended periods of time, but 5S is applied across the shop, most workbenches have semi-standardized foam cut-outs for all the tools, and the tools tend to be kept in good working order for years. It takes a lot of time up-front to organize shit, and periodic maintenance afterward, but when you have what you need where you need it, you get rid of all the shit you don't need, and you use the right tool for the job, shit lasts a lot longer and work is easier.

As long as you don't have super high turnover (indicative of bigger problems), you just need to get everyone invested in it.