I don't much like that differences in sizing are not taken into consideration (not all fonts are equally large at a given pixel size).

I have been using Fira Code extensively and also writing texts. Both in English & in Greek, both spotting my mistakes and reading what I'd written improved within minutes of first trying it out. I may give JetBrains Mono a try as well, though I really am taken with Fira Code.

Unfortunately I have yet to find the perfect general purpose font to use in general. Ubuntu fonts do come really close to being perfect.