I mean, nothing stops you from taking the device tree from raspbian and tinkering with other distros. But that's true for most other boards since they have to ship a device tree with their official image.

Raspberry Pi supports their images long term however, so you won't have to do that anytime soon.

Another benefit of raspberry pi is its popularity, there are just more projects out there compared to less known SBC manufacturers. Iirc the Archlinux arm project have images for the raspberry pi 4 (maybe 5).