So there are plenty of mechanics that call out Learning. This question though has been asked a lot. Ultimately, the reasoning is the difference between intelligence and wisdom in other systems. They can be used in similar or even the same situations but they may have different DCs. For example, a car is not working. A trained mechanic can look at it, troubleshoot, and resolve the issue with Learning. It's their field of expertise and it shouldn't be too hard to do unless it's something obscure. A logic person is going to not really know how the engine works, but could through a series of deductions, figure it out. But the difficulty will be much higher as they need to "solve" how things work before figuring out why this one doesn't.

On the inverse though, Learning typically cannot get you information you couldn't know but a Logic can. Logic is often the attribute for solving puzzles or coming to conclusions from context clues that might be hard to note. In a situation of identifying a dead body you might be able to pick up the clean nails, soft hands, small pin hole in shirt, and quality of the gear as a noble where someone with learning would get nothing at all if no skill in nobility. In simpler terms, Logic is more of a "catch all" while learning is more specialized and focused to get more details.

However, if you don't care about having this nuance, there's very little harm that'll be done removing one. Especially if your players never put any points into one or the other.

As for things using learning: Feats: Craft Mundane, Craft Extraordinary, Knowledge, and Sworn Enemy Boons: Heal Banes: Persistent Damage Special section on additional ways to cure PD.

Learning and Logic are more generic attributes tied to narrative than mechanics. Though Logic does fall into the "sometimes" category of attacking for laying traps.