Your fstab file can remain unchanged and still fail, if the drive or user identifiers have changed unexpectedly. It depends on how you’ve configured your fstab entries, which is why it’s helpful to share them. In future, no one will be able to offer much assistance without seeing the entry details. Either way, glad you were able to get it sorted!
Since adopting a Flatpak and containerized workflow, the choice of distribution matters a lot less to me now than it did 10 years ago.
The majority of apps that I use everyday can be run from any host. And I can install fedora, arch, debian, or whatever I want as a container, whenever I want it, without any thought to my host system.
Ideally, Flatpak’s UX will continue to improve, and upstream app devs will continue to adopt it as an official support channel, which will improve overall security and confidence of the platform. Image-based, atomic distros will be further streamlined, allowing for even more easily interchangeable host images. At that point, traditional distros will be little more than an opinionated collection of command line tools and programming environments.