The Borg were such a brutal enemy to defeat, largely in part because they would adapt to phaser fire so quickly. Which makes me wonder why they never used regular ammunition against them. I know it's the future and it may not be readily available, but it still seems ridiculous. Furthermore, picard once used a Tommy gun in the holodeck for that exact reason, which proves he was aware this was a viable option. I have trouble believing picard with that information and a whole starship and crew at his disposal could have such a hard time making projectile weapons, when kirk could do so by himself with some bamboo and rocks to defeat the gorn. I understand that it's mostly for story telling reasons to make the Borg a bigger and scarier threat, and make them still a threat while slowly walking In cumbersome costumes, but it seems like a huge oversight.