Hacksaw - When is it useful?

i saw once super cool usage. It has homing missiles that one shot swift - so by building "hacksaw wall" (i won't find replay :( but that guy just made sure their range is connected) u can prevent enemy scout. And it it cheap enough to do so - artemis often die to silo.

they can with proper macro - but on big enough map u can place hacksaw before they want to use boost or at the end efect of boost - ngl i didn't test it - so maybe good air player can eazly counter that - it just look promising in that match

EDIT
https://zero-k.info/Battles/Detail/1940740
ok i tested it also - and it does seem to be working (?). With 2 walls of hacksaws (5 each total of 2200 metal) it manage to stop 5 swifts all the time (10 swifts seem to be too much, also when 5 of them are cluster they also get through). But it seems for it costs it is good scout prevention (?)

Hacksaw = oneshots Phoenix and Raven, and instantly makes cost if doing so.

Hacksaw is good opener against air units: The hacksaw can take down initial lone striker, no matter the armor. This can buy a player some breathing room before transitioning into heavier AA.

I use hacksaws to feel like my antinukes and singularity reactors are safe from aerial attacks, if I don't know whether or not the enemy is going to commit into aerial bombardment.

If the enemy gets a bigger airforce, I can easily transition from hacksaw to proper anti-air, be it gunship tridents or spider tarantulas or crashers or anything else.

Overall, the hacksaw makes you less stressed in the early game, letting you focus on epic ground battles before the airstrikes arrive.

(Saying this as a small giant certified)