I have both two OPi5's and an OPi5 Plus, and honestly? It's not a problem. Armbian support's there and is emphatically Good Enough for the 90%+ case. They're excellent boards.
If you want to talk about bad support, let's talk about something like the NanoPi R5 series. Oof.
The big current issue that prevents me from using my boards is lack of GPU drivers. Armbian has instructions on how to use the panfork fork, but even those are not good. The panfrost team definitely do good work, so I have high hopes for future drivers. Especially with desktop OpenGL support that the rPis never got.
So I do have a rPi 5 ordered because they've advertised full upstreamed mesa Vulkan support on release. Maybe desktop OpenGL via Zink on top of Vulkan will be good enough.
The vendor OS is clunky and weird, Armbian doesn't have support (for the R5C at least), it doesn't have NVMe support (only a wireless m.2), flashing the eMMC is really weird...I wouldn't buy another NanoPi. I quite like the Orange Pi 5's for RK3588 boards though.
If you want to talk about bad support, let's talk about something like the NanoPi R5 series. Oof.