That's a good point. We used to partition our disks and assign space budgets to specific partition/mounted directories. It was to me a PITA, and juggling with

That's a good point. We used to partition our disks and assign space budgets to specific partition/mounted directories. It was to me a PITA, and juggling with partitions, redimensionning them because circumstances changed, moving files from one partition to another because it was getting saturated etc. were horrible. Instead of having a tool handling that horror, thinking of disk space as a continuous resource and checking from time to time where that space go and if it needs cleaning is more manageable IMO. I have the same mental model for money, and outside of very specific cases (mortgage accounts, kids account, professional expenses etc.) I don't think it's worth it partitioning at the account levels just for the sake of it.