Hardkernel has supported their ARM boards for 10+ years. The Odroid XU3/XU4 line, for example, was released a decade ago and still has active development from the manufacturer with recent kernels and images.
I was really excited about those hardkernel boards 10 years until I got one and found I had to use their outdated custom version of Ubuntu and still half of it didn't work.
I assume things have gotten better since then but they don't have 10+ years of good support.
