[michaelmrose]

Per user installs are unnecessary for most users. Firstly most machines are single user. In multi-user machines installing additional software/libraries system-wide has no downsides. If a particular piece of software can't be installed globally without conflicting with other software it probably needs stronger isolation than your user account and you have multiple better options to achieve this.

The sole case that leaves are cases in which your company doesn't allow you the necessary privileges to install software which is an organizational challenge not a technical one.

That said something like nix can allow you to install software per user.