With few exceptions, ARM-based SBCs of this kind run vendor-specific patched Linux kernels (usually older ones). As one would expect, the quality of these patches varies from bad to absolutely terrible. Additionally, these patches typically never make it to mainline. If you visit the hardkernel forums [odroid vendor], you'll see people casually swapping patches to get functionality like USB to "work". When the devices are EOLed, they become paperweights since one is stuck with the soon-to-be-completely-obsolete frozen vendor-specific kernels.

These are all good reasons for people to stay away.