UE4 has great tooling but their UI is really cluttered compared to other engines and their UX is split into many panels. I wouldn't say it's difficult to learn

UE4 has great tooling but their UI is really cluttered compared to other engines and their UX is split into many panels. I wouldn't say it's difficult to learn UE4 but I think it is overly complex which can be a high barrier. I've used it and unity for years. Opening unity is generally less mental fatigue, like walking into an ordered office, whereas unreal is like falling into someone's messy room.