Although I'm personally not a fan of ligatures, I feel they may increase mental burden at times;
for example having to look closely if it's = vs == or == vs === among other examples.
You’re right! Check out the NL (no ligature) version: https://github.com/JetBrains/JetBrainsMono/tree/master/fonts...
Conversely I can turn them on for code I didn't write.
There is no downside to ligatures.
I still bought it, because it's gorgeous, thank you for sharing it. I've emailed the font creator so hopefully they've got plans for thinner versions.
I wasn't able to find anything better yet after trying a lot of fonts: Fira, JetBrains Mono, Iosevka, Monaspace, Ubuntu Mono, and others.
Or perhaps I'm too familiar with Hack now and everything else now looks weird..
Fira Code: free monospaced font with programming ligatures
https://github.com/tonsky/FiraCode
EDIT: @airstrike beat me to it. Anyway, that's my favorite.
Can highly recommend, also it is free and has several styles(x5).