It's true but he's got an even bigger problem than that. He's behind Mandzukic and Dybala I'm pretty sure he doesn't like this. At Arsenal he'd be a starter for sure.
It's not like it's all perfect for Morata here. I don't know him but young players often think the grass is greener on the other side.
It's all up to other clubs IMO. If some offers huge money, RM will trigger the clause because those are nice money to earn. That's why we want to collect best Italian talents, because they won't see anything better than Juve, it's the top for those (mostly). Our squad is very good and competitive and now also young but too unstable IMO.