PPAs work great until they don't, because it's just some random guy building the packages half of the time.

The last time I seriously tried to use Ubuntu was probably 8-10 years ago and I ran into a lot of trouble trying to get up to date graphics drivers via PPAs. I also remember being tired of having to go find a random PPA for every piece of software I wanted. Most of the time I would just find some random blog that provided a "PPA for up-to-date package X" and ultimately felt like what I was doing wasn't really any better than downloading random MSIs like you would on Windows.

With Arch though you get the AUR which quite literally has every piece of software you could ever want and is at least managed and maintained in a central place so you're not just adding random PPAs for everything.