I don’t use Arch but if I did id probably go with archinstall. I don’t see the point in going from scratch unless you absolutely need to. I could care less about bragging rights for installing an operating system lol.

My answer is boring. Almost nothing. I feel like I finally have things dialed in. Except maybe my desktop experience. But beyond that the most i see myself doing is making some upgrades to my PC like a larger nvme drive since i edit with resolve on a 500GB nvme & if you’ve worked with clips in resolve on Linux you know how huge the files can be. One project can be 50 GBs.