I don't mind pets in the ranger class, as long as I have an option not to have a pet. Afterall, the "lone wanderer" is a common ranger flavor as well.
The issue with pets seems to be the design space. 5e is extremely sensitive to action economy changes, you really can't have a competent battle pet that gets its own actions in addition to yours, it just becomes OP too quickly. Trading out your actions for the pets has not been popular.
Probably the best answer is a separate class, where a bulk of the class's power is the pet, and so you can make the pet hardy and strong without imbalance. This to me lends itself best to the "pokemon trainer" style of flavor, a relatively weak master with a strong series of pets. Could it work for the "beastmaster" archetype....probably.... you would probably need to give the class some options at certain points to "boost the master" or "boost the pets", so you can design where on the spectrum you want to fall. Beastmaster would take more master perks and a few beast perks, Ash Ketchum would take all pet perks, that kind of thing.
The issue with pets seems to be the design space. 5e is extremely sensitive to action economy changes, you really can't have a competent battle pet that gets its own actions in addition to yours, it just becomes OP too quickly. Trading out your actions for the pets has not been popular.
Probably the best answer is a separate class, where a bulk of the class's power is the pet, and so you can make the pet hardy and strong without imbalance. This to me lends itself best to the "pokemon trainer" style of flavor, a relatively weak master with a strong series of pets. Could it work for the "beastmaster" archetype....probably.... you would probably need to give the class some options at certain points to "boost the master" or "boost the pets", so you can design where on the spectrum you want to fall. Beastmaster would take more master perks and a few beast perks, Ash Ketchum would take all pet perks, that kind of thing.