Vulkan can't possibly be the most widely supported graphics API can it? I have to imagine that targeting older hardware is better with OpenGL because it's been around forever, but I don't actually know and a quick google search doesn't turn up much.
I did some graphics work in my last job. OpenGL2 is supported by just about every device made in the last 15 years, on every major operating system, including software OpenGL in VMs.
Vulkan is not officially supported on OSX (although there is an unofficial port that is quite good, from what I understand) and only runs on modern hardware.
And neither is OpenGL
And, like, Apple ported OpenGL to Apple Silicon macs. I suspect it's going to stick around, it's just never, ever going to get updated.
Yeah, that's how crap Apple support for OpenGL is.
I used to develop a Qt/QML app for Windows it was impractical to leave hardware acceleration enabled. In then end, using Mesa/llvmpipe everywhere was just more reliable.
Even with 10 or later, if not using Google or Samsung flagship devices, you will bump into driver issues.