Exactly.
Thanos wants to either to please Death and/or kill for the sake of omnicide alone.
The Maestro motives are quite different. He wants a challenge, to prove he's the Strongest there is and the Smartest there is. He wants more than to rule one world or one universe. He wants more, he desires more, and he'll let nothing stand in his way.
Problem is none of the writers have done anything with him yet. The Maestro has the power and intellect to be a Thanos level elite villain at bare minimum. He should be the most powerful, intelligent and dangerous Hulk in existence. A conqueror of worlds and universes, a true Multiversal threat.
The Maestro should be portrayed as an Elite Villain of the utmost power and intellect.