...why they don’t do it all the time?
This part is sort of consistent. Apparently, our heroes were unaware that the S31 ships were capable of drone warfare at all. Perhaps they had a vague idea that the ships sported drones, but only for spying purposes. Indeed, it seems more likely for Control to have modified preexisting swarm craft into combat units than for it to have built combat drones out of whole cloth - we see our heroes can sorta-replicate some stuff, but we also learn it's slow and tedious work, and Control probably couldn't do much even if it had a few hundred pairs of helping hands.
So the capacity for drone warfare is actually new. Control can do it with craft only barely bigger than a photon torpedo, but Starfleet is merely experimenting with much larger and clumsier craft. And it turns out neither is any good against the other: the swarms don't manage to hurt each other to any noticeable degree. It takes ages for a pair of good guy units to gang up on a single Control bot...
What the swarms can do is pester the capital ships, although only Control tries that; Pike goes after capital ships with phaser beams from his own ship instead. the Battle still drags on for a full running
hour. Not really viable, except as a desperation measure - in the Klingon War, ships deprived each other of shields in a matter of minutes. So basically fighting with drone swarms is like beating the opponent with boiled cauliflowers - you only do that if you don't carry any actual weapons of war, or are cornered by superior numbers and aren't interested in maneuvering and thus don't have anything to
lose by adding the cauliflowers.
It does look pretty silly. But it has every plot logic and dialogue excuse for being a one-off and probably also a first.
Curious how the
Enterprise fighter-bikes have what looks like big canopies above and below, but not a single shot that would suggest a pilot inside. This in contrast with shuttle close-ups that happen for the very purpose of showing the pilot... So my bet is for optionally crewed drones.
Timo Saloniemi