Just because Ubuntu has "ARM distros" doesn't mean those "ARM distros" have the necessary drivers needed to actually use all features of your SBC. The fact that Vulkan support in raspberry pi landed in 2020 should tell you something.
Even the most well known SBC series is getting driver support at a glacial pace. When was the last time you waited for your x86 iGPU to get vulkan drivers?
Even the most well known SBC series is getting driver support at a glacial pace. When was the last time you waited for your x86 iGPU to get vulkan drivers?