He might not be the most conventional player offensively but it is effective. It doesn't really matter at the end of the day how the puck went in. My biggest issue with your statement is you said Hall doesn't elevate the players around him and that is patently false. Look at the underlying numbers, you will be surprised.
The problem with this is that hall is extremely effective with underlying stats, due to his pucks on net, shot attempts, and offensive zone finishes. At the eye test one can see that his shot attempts are as a proportion, weak and often of low probability, regardless this helps his corsi. Likewise, a goalie will often cover his weak shot attempt and allow for a offensive zone face off for all, again attributing to his advanced stats.
Again, I believe hall is a tremendous individual player, and most teams would love the chance to have him on their team, but MVP? I’m not even sure if he’s top 20 in the league.