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The amount of time the battery spends at higher voltage definitely affects its capacity over time. There's plenty of research on Li-ion battery service life characteristics done with greater scientific rigor than is possible with batteries installed in phones.
It can take longer than the few months these tests required to see the effect. A phone that's usually stored at 60% will eventually show a big capacity advantage over one that's stored at 100%. That's probably mostly true at 80% as well.
For some anecdata, my Pixel 4a has spent most of the past five years limited to 60%. It reports 1152 cycles and 91% capacity.
But is there an advantage on artificially limiting your battery to 60% rather than charging to 100% and having 40% degradation at the end of the lifetime? In the second scenario I start at 100% capacity that slowly gets lower and lower whereas in the first scenario I have only 60% from the start and still some (although much less) degradation.
The advantage is that I can occasionally charge it to 80% or 100% if the situation demands it.
And if it can run a 6 hours with 60% then I would like to preserve its ability to hold on for an entire day at 90% if the situation demands it. I often deal with this at school. A half day of back-to-back classes? 40% is game. But a schedule that has more than a 6 hour gap that I'd likely fill with studying from PDFs and gaming? Then a good 90% is needed.
School seems like a good use case for a powerbank since most people carry backpacks to school.
Yes, but given how the battery charge controllers already manage it, I don't think you'll see a meaningful difference. You'll probably replace it for other reasons before then.
Dude runs a 4a. Probably not.