I have a small suspicion Android might not handle ui-serif and this is the place I am going to test it. Anyway modern devices are going to use ui-serif and if it fails, system-ui might also fail, and then it's back to my expected font set.
On physical iPhone SE2020 I am seeing nasty line hyphenation in my
name, while I am unable to reproduce in devtools simulation and while
thinking of increasing the avatar size on mobile, I accidentally
stumbled onto this solution (like my CV uses on mobile) and I liked it
so much that I have to try it.