Compare that to Linux, 10gb with a full gui, and minimal bloat after the fact and it’s extremely frustrating.
Both my teenagers have 2x 1TB NVME drives installed to deal with the insane requirements of Steam, Epic and Xbox gamepass games.
We live in Australia with ~25Mpbs download FTTN, so installing and uninstalling is a huge pain and isnt practical.
I have a similar issue with Apple selling Macs with 256GB hard drives! Even with iCloud photo and docs offload, these Macs are close to useless as you'll constantly bump into storage issues.
Steam is another beast, you could consider a steam cache server or similar, or alternatively teaching your kids how to xfer unused games from primary storage to secondary, and drop a 6-10tb drive in each machine.