Considering that, using the Special Modifications prices for labor, an ATA with all the Mods costs 19,000 credits and is a drop in the bucket when compared to the price of almost any capital ship. There is no good reason that every ISD, VSD, MC80, and many other ships with hard points shouldn't have a fully dressed ATA. And then it just becomes a must-have tax on the hard point capacity.
By that same logic, every ship should have fully modded Droid Gunner Brains for each and every weapon they have installed. It’s only money, and it’s not even a drop in the bucket compared to the total cost of those ships.