I don’t think you fully understand the entire purpose to the reason why being vote-kicked out of a random dungeon has a deserter:
Mythic+ Dungeons are on a different system than the random dungeon finder. Because you’re not randomly queuing up, and the group leader has more agency over control towards the group compared to random dungeon finder. Which yes, you can be removed from a group in a Mythic+ dungeon without there ever being a Vote-Kick.
And Blizzard is not going to punish people who initiate a vote-kick towards others in the dungeon.