Even the Linux nerds who customize everything about their computer are probably still using the QWERTY keyboard layout. I’ve seen a lot or “arch btw” but never seen “dvorak btw”.
I’m an Arch user and I did try Dvorak for a few weeks. I eventually gave up because it was a huge hassle switching back and forth, remapping game controls, remapping code editor key combos, and so many other remaps. It just wasn’t worth the effort.
I’ve learned all the new combos for Dvorak and I don’t really care that Ctrl + c isn’t next to Ctrl + v anymore tbh