Homing turret is handy for small machine crowd control and crafting them isn’t very costly, maybe even cheap. Where it costs using them is the weight they cost to carry them. To be effective you need to carry a few and that weight takes up space for other resources that may also be needed.
I can see them more useful in a base defense operation. Where you have a locker full of them, pull out enough to deploy a defensive perimeter between waves of machines and the turrets take out the smaller waves of machines. If the turrets would just fire at the smaller machines, but they don’t. They are a waste when a salvo of 3 rockets hit a military tank and only a 1% drop in health is a waste of the salvo. I don’t do base defense, not in a game that base defense was popped in after 3 plus years of not being a base defense game. Base defense you know what and when there will be an attack, set up your defenses and pick off what your base defenses do not. I got bored of that before there were control points slapped into the game.
Needing to be highly mobile, I am still stuck on hunt and destroy, (what Gen Zero has always been) with just 4 weapons of four different specialties. And the ammo for each weapon. As a nomad I collect and loot what I use as I go, save up to craft exp ammo and continue across the map to destroy machines. Spending very little time at the safehouses to resupply/drop off resources and crafting. My locker only has what I use to destroy machines and my pack mule holds all the shiny stuff collected that was only fun to play with a little while or tested for performance then put into storage. Other than the two very first DLCs that expanded on the map and added to the nomad style of play, the pay DLCs have been nothing but a bag of candy that once played with for a little while, then tossed in storage will continued to be bought as a way to support development of the game, not for the bag of candy.