And we must accept that Voyager, a single starship, can dance around like a fly and survive attacks from these very same cubes. Or that Seven's parents in their little boat can walk right up to Borg Central and spy on them...
The ENT-D survived attacks from the much more powerful Cube in BOBW.
Seven's parents being allowed to observe the Borg fits every other appearance where the Borg just ignore folks until they do something to get noticed.
No. It had been 6 years and in that time the Borg are also upgrading their technology at a MUCH faster rate. So nothing Starfleet comes up with could ever stand a chance
Which is why the Borg are only good for 1-2 stories.