having worked at a company where things have devolved a couple of times into the "no restrictions" mode, you also end up finding that production reliability suffers drastically as well.
everybody thinks that they are above average in their ability to decide what to run, and this gets people in trouble.
Preventing them from installing packages doesn't solve all the problems by any means, but it does put people on notice that they aren't supposed to be doing that.
This sort of problem doesn't scale linearly with the number of users either. If you need one admin to help 5 people, 5 admins can't keep up with 25 people. It seems like they should be able to, but in practice they can't.
If you aren't willing to live with this sort of restriction on your work computer, find a job at another company, and be prepared to do so again in a few years as that company either grows and starts to implement restrictions, or goes the other direction.
Or become valuable enough that they make exceptions to their policies for you, but this takes having a track record of doing things right and not causing problems.