Necro bump, but it’s excellent research that’s still relevant.
OpenGL Hardware Database by Sascha Willems has statistics that support the idea that 8192 is starting to be more widely tolerated, but I’m not clear on the data source.
Seems like maximums are mostly governed by what market segment you’re aiming for.
Optimizing a Defold game seems to have been passed by the times, only listing iPhones that are now regarded as ‘obsolete’ by Apple. I might try updating it if it’s on GitHub somewhere.