I think if we had better aggro management and pet latency a pet tank would be a really neat concept, you could have three (maybe plus one from the meter) pets with different skillsets and bonuses which you direct and support in fights. One could favour dps for example, the second having more mitigations and the third has more party options which would give the player agency to pick the one that best matches the situation they find themselves in.

I feel like the devs are averse to having a skill floor set that high though.