I wouldn’t go that far to say that they have fantastic interfaces. Tolerable? Better than what free options existed at the time? Either way, there is a lot of room for improvement but it’s also an extremely challenging environment to get interfaces right.
We are still in what is effectively the skeuomorphism for the music production industry phase (where everyone is just replicating real life tooling because that’s the expectation and with that comes a lot of unchecked baggage — except for Maya, Blender, etc it’s mostly about making assumptions based on past tooling and polishing that a tiny bit), eventually there will be a Logic to change those bad habits!