No problem at all. When it just works, there’s no reason to throw it out. I suspect one could generate an image for 10 that would work on a pi 3, but itd take a bit of work. We use kiwi to generate our images. As of 10, gfdisk isnt available and thus gpt disks are easiest. I’m not saying mbr isnt possible, just will take a bit of extra work. kiwi descriptions are here