Zero installs, all web apps, where users don't control their data. The average users computer ability has no doubt dropped over time as software is catering for the lowest common denominator.

As this catering becomes more popular, this is the expectation people have, only original hardware vendors will be installing native apps. Sucks, but its the graveyard that we've built.

Google does similar things. Why do some apps install bloat in ~ or ~/Documents without letting me chose where ?

If you want to sand box applications you need to use VM. Because some crap permeates the whole system.

I’d like the OS to run a separare environment for each user or application with little to no access to my main installation.