kiliman/operator-mono-lig on github patches it to support ligatures. And I wish Hoefler guys added support for more languages
Video and some code screenshots: https://typography.com/blog/introducing-operator
Character set: https://typography.com/fonts/operator/overview
Free fonts are nice, but some paid options are polished to a different level.
I also use Inter heavily in my Obsidian setup, and I'm very happy about it, too.
However, sometimes one item speaks to you more than the others. It's not about free vs. paid. It's more about finding something more useful than others, and the difference justifies the price tag on it.
In that sense, Monolisa is not my cup of tea design-wise, but I have friends who absolutely love it, and I understand them.