[fao_]

The main flaws with UAC is that you don't know what application is asking for it (This actually ties into a deeper problem which is, you don't know where application binaries reside, and applications are less predictable on Linux). Instead you have to correlate with what you've done recently, which might not align with the process that requested permission.

[raptorfactor]

This is not true. Here, I took these screenshots for you where I copied an unsigned binary to a random location and forced a UAC prompt:

https://i.imgur.com/BSJlSAf.png

https://i.imgur.com/4ZVNsPN.png

I also did the same with a signed binary:

https://i.imgur.com/xpSiMMY.png

https://i.imgur.com/ACLydv0.png

[fao_]

Interesting! Looks like my memory failed me, the one time I don't double check...

[zaat]

Not sure what you mean, this is not generally true - the dialog states the name of the process or the application requesting elevation, as you can see in a quick google pics search.