You can play with humans forever online. There isn't a lack of people willing to play.
Will those players analyze and rate your moves like a chess engine will? Will they name common opening strategies for you so you can research them in books? Will they let you take back several moves to explore different lines?
AI can do that to a game you play against humans.
Yeah, I've used that a lot. Yet another example of how AI engines can help you learn quicker.