A lot of ideas for the pet have been tossed around, I think this is one that would please the bulk of both sides, especially when you consider you can have different load outs for:
Raid ST
Raid Cleave
Raid AoE
M+
Open World/Delve
etc.
The thing is, such have either been ignored or treated like it would keep holding MM back. To that, I just have this to add: anyone against talents that enable those that want to keep the pet, especially if it is a trade off of some kind, it is not about the pet, it is about wanting to remove player choice and push all players of the spec to play the same in all content.