I think you're confusing "fine" with "perfect."

Fine is a synonym for "satisfactory" or "acceptable."

"Fine" in programming specifically, usually translates to "I can use it to solve my problem without the flaws in it inhibiting me from doing that" or "I can forget that I'm using the tool and just focus on solving the problem."

Many things in the world are "fine" by this definition. That doesn't necessarily mean they're all good, let alone perfect — but they're fine.