To be fair and honest Morata is all around better footballer and will become more "complete" striker than Lukaku. That was my POV during summer and why I wanted him here while people were calling him Madrid sub and "Oh we shouldn't bring a Madrid cast off" just like the Matic nonsense but anyone with eyes will know Morata is a great striker.
However, we shouldn't bite our nails and regret not getting him. Lukaku is a very good striker with lots of strength to play on. He will never become a complete striker, but he has the tools to become an elite one. He needs to play on his strength and ignore his weakness, more than spending time improving his weakness that some of it will never improve IMO. He's not going to become great technical footballer, stop it, depend on your physicality, keep the ball under pressure with your body to bring your teammates forward, win most of the duels, bully defenders towards the goal. Do everything a striker with this size will do and he'll become an elite one.
Lukaku should focus on his strength points and use it to their fullness.