I liked Maul’s arc in Rebels, but i agree him surviving death after Phantom Menace makes little sense.
We all now know the reason George brought him back for Clone Wars was because he was supposed to be the big bad of the sequels he was planning.
Which is ridiculous.
Kenobi made short work of him in Episode I, the idea Maul would rival Palpatine is absurd. Or that he would be difficult for Luke to handle in like 3 seconds, without some neophyte Padawan’s help.