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The inverse is also true - cannot download an 60Gb game due to partition size being too small even if there is cumulative free space available.

Ah, yeah, that makes sense, thanks. My experience as "sysadmin" has largely been from the standpoint of personal systems for which that has mostly not been a big concern for me.

This is much better solved by quotas which can be adjusted on the fly without rewriting your partition tables.

Ironically using "modern" filesystems like zfs or btrfs you can do that if they are on the same disk

Partitions are still on the same disk?