I normally do not use webfonts either, although I do use a cascade of fonts ending in serif/sans-serif to use specific fonts if available. As you say, it’s not very important.

But there is one where it did matter: the Nigerian Oil Spill Monitor [1], a data entry and exploration application I built in 2013-2019.

I did try different free fonts, and found that with Ubuntu I could read the data much more accurately so I put it there as a webfont even if I was trying to minimize the amount of data loaded. (Internet bandwidth in Nigeria was not great at the time; many of our users used the application through shared GSM links.) Maybe by now, with the application’s users having better screens and improved font rendering, it would be fine to remove the Ubuntu font. Back then, with fewer pixels, it was the best way to pack information in the screen.

[1] https://sentido-labs.com/en/portfolio/#Nigerian-Oil-Spill-Mo...