I had a very similar experience as the author: I used and adored Arch, but the rolling updates got to be over whelming. Fedora (not Silverblue in my case, I still need to try that out) was the perfect solution. Very similar in philosophy to Arch, enough so that the Arch wiki is still 95% applicable, but very stable within major releases. It also was a bonus that learning Fedora also taught me CentOS/RHEL at the same time, which started coming in super handy when I needed super-stable and/or server-side OS. Nearly all of the skills (and even scripts) are fully compatible with both, with only the occasional minor difference. I still have a huge warm spot in my heart for Arch, but I rarely use it anymore (mainly on my pinebook pro for building ARM packages of my software).
Yes, likewise. Debian-based distros won't be wildly dissimilar, but you'll have to modify bash commands and stuff to fix paths that are different, conventions, and other things, whereas on Fedora it usually just works as is, minus a package name and a `dnf` v. `pacman` here and there. High level concepts will usually be the same, but when tweaking a Debian-based system you'll have to learn whether or how your distro of choice does it differently.
It's definitely time for me to try Silverblue