Unfortunately, no, I haven't got any more insight on this. My guess is that the limitation has its roots in a time when graphics memory was much more limited than it is today (especially on mobile) and simply hasn't been updated. That's just my guess, though.
eykatz How can I reach Harman on such a manner ?
Michael directly tagged Andrew Frost from Harman in the issue you created – give it a little more time, he often takes the time to respond to such questions.