I'm not sure if maneuvering as such helps stop the Borg from locking onto a target, as targeting systems in all of Trek are virtually omnipotent and foolproof. It does give the Borg a constantly changing battlefield, though, and Starfleet would certainly like to keep the Borg as confused as possible. Since starships are built to move, why not move them?
At the very least, ships that have performed an assault at close range (to minimize reaction time, to maximize beam weapon intensity, or for some other futuristic tactical reason) can retreat to a greater distance to lick their wounds while unharmed vessels or vessels already recovered from their most recent damage can take their place at keeping the Borg busy.
Using deflector weapons sounds like a good idea overall, but it may be that it's much more difficult to retune a deflector "on the run" than it is to retune a phaser. And we have seen that a single-frequency deflector beam is impotent regardless of the frequency chosen; no matter how powerful, it is still easily defeated by the Borg. Then again, I'd like to see how the Borg would cope with ten differently tuned deflector beams aimed at the same spot... I hope a deflector beam isn't categorically impotent against Borg shields now. (It shouldn't be, not when the supposedly weaker phasers still remain practical weapons against Cubes.)
FWIW, one of the ships kitbashed for DS9 was a clever if ugly combination of the forward hull of
Voyager and the aft section of a F-14 fighter, with the two jet engine nozzles facing forward and looking exactly like navigational deflector arrays. It would be fun if this were a special anti-Borg ship type, designed to fire at the Borg with one deflector while retuning the other...
The First Contact approach - hitting it with weapons fire from lots of ships at a specific target as directed by Picard, all presumably set to different frequencies, worked.
Here, timing was probably as important as the massed use of firepower. Picard told the fleet to wait for his command (and we saw that at least two starships got destroyed while waiting) before firing at the supposedly unimportant spot; apparently, he had inside information that some key function would be rerouted to that spot at a specific moment. Without Picard, the attack would probably have failed despite the concentration of fire and the application of multiple frequencies and weapon types.
Timo Saloniemi