Agreed. DaVinci Resolve Studio and Blackmagic hardware drivers are examples of that kind of niche software that I use on a regular basis. The only supported route for that stuff is RHEL/CentOS, and those don’t seem particularly well-suited to my main machine’s other purpose, which is games. If someone’s already done the legwork to solve the problem for Arch, and the build files check out, why reinvent the wheel?
Additionally, it’s the only distro I could get Resolve Studio working on with an AMD GPU consistently.
For the most part, though, the official repos and Flathub give me what I need.