the ideal harem size in videogames is 3
Any more and you get infighting
Any less and it's not really a harem
2 ganging up on 1 isn't so bad if it comes to that, easily manageable
But 3 ganging up on 1 is exponentially harder to work with
Allah forbid 5 or more, you just created whole factions
also you can divide your attention easily. If you want alone time with one, the other two have each other to keep company.
Same deal with training parakeets kind of. You can really only train one at a time properly, if you have 4 parakeets. and you take one out to train, when you put it back, and take the other one out to train, the other two will undo its training because it's what the default back to in a flock. If you have 3, you can do it one at a time and just one parakeet won't be able to undo your training, BUT the also the other parakeet will have a second one to keep it company