As an object of focus, yeah. I mean I've seen various aunts and uncles of school aged main characters showing up as groups, but they're always very minor characters.
I still really hope that some day we'll get a romcom that pulls a truck-kun after a couple of years, and just transitions into an Isekai without batting an eye.
She's 21, which is late for sure, but people with growth abnormalities (I think a 2m tall Japanese woman qualifies...) can keep growing until pretty late.
They can potentially be better for certain tasks, but right now quantum computers are effectively research toys. Supercomputers actually get shit done.