It can be quite tricky to actually see how much space is really being taken up on a CoW system in general. Sometimes it’s best not to pay too much attention to the figures.
You can get a lot of double counting and false reporting that can make the system seem to be taking up more space than it is.
It’s interesting to see all the general file system add-ons that are getting added to the Linux kernel every month. There have been a lot of recent improvements.