That’s not the issue with the Pine64 ecosystem, though.
The direction they’ve chosen is actually similar to what Raspberry Pi has chosen: You can boot alternate OSes, but the primary focus is Raspberry Pi foundations own needs and everything else comes secondary. This is what it takes to keep a project like this alive, and they know it.
If I put a SD card with ex. Alpine Linux into a pi, it'll boot into Alpine Linux. If I put a SD card with Alpine Linux into a Pinebook Pro, it'll boot into... Manjaro.
EDIT: Actually I guess the Pi 4 added an onboard flash chip with an early bootloader, but I can't figure out if it impacts the boot order or changes how hard SD boot is: https://www.raspberrypi.com/documentation/computers/raspberr...