Nobody cares. If you don't like them, then don't use them. They are optional.
Lots of people like them. Let people like things.
Authors of content and programs with ligatures-by-default subject their readers and users to the penalty of ligatures.
Some people like pain, but that doesn't mean we need pain switches on everything with pain set to on by default.
It's obviously personal preference, because many people prefer it. If I found ligatures harder to read or edit then I wouldn't use them, but I don't, so I do.
> programs with ligatures-by-default
Such as?