I'm not sure if altitude affects flavor like it does for coffee. I moved from 500ft to 2400ft last year. So far I noticed Kadota taste terrible up here, flavor was what I imagine hagfish slime taste like, a strong slimy fish flavor, but It may be the lack of enough heat to ripen correctly.
I found my magnolia figs taste great up here, like perfectly ripe dark plums.
I had a green unknown fig that I almost got rid of, because of lack of flavor and it had amber interior at low elevation, but bright red Interior and a nice tart/sweet flavor when it ripened up here.
Pretty much a mixed bag, some much better, some much worse. Not sure if it's the altitude, temperature, or a little of both.