> I don't see ligatures solving any important problem.
I see ligatures as solving, imperfectly, the problem of "my language has clumsy operators because it wasn't designed with support for unicode operators" lining up with the preference of "I prefer less-clumsy operators".
If you don't have the first problem then, even if your language also supports ASCII multicharacter operators, its just an autoformatter issue.
Aside from the ambiguity with similarly-appearing genuine single characters, programming ligatures tend to not really solve the problem they set out to in monospaced fonts, where you end up with a single symbol which invariably preserves the width of the ASCII multicharacter symbol, which either introduces extra empty space or extra visual weight or, often, both.
> My personal opinion is - and I'm fine taking negative karma for this - that ligatures mostly appeal to the front-end developers among us.
I've seen more praise for them from corners of the Haskell/Idris community than from the much larger front-end community. I don't think there is any real correlation between working in front-end and preferring fonts with ligatures.