https://fonts.google.com/specimen/Inter?preview.text=lllll%2...
I never understood why a font designer would ever choose to do that. There should be an ironclad rule that different letters must look different.
It's not used because it's the default font in Figma.
It's the fact that it's the best modern alternative to Helvetica, making it universally useful and therefore the default in Figma.
Incidentally, I'll forever mourn that the designers didn't choose to go with a glyph for "1" that is closer to the one in Helvetica.
I guess I can try to argue that it if it weren't as generally useful as Helvetica it wouldn't have been made the default in Figma and it wouldn't be, well, so generally used.
Alternate glyph set that increases visual difference between similar-looking characters.