Right, we used dedicated air-launched drones, though.
You wanna bet they're working on stealth versions of those now? Decoys that are hard to see and will fool the enemy into thinking they've just managed to track some stealthy planes and fire on them? I certainly would be making them if I was working in that area.
The only issue with converted A/C is they have all the same limitations as far as range, meaning that they'd only be able to launch them from their own soil and be incapable of AAR. Also, if you crowd your bases closest to the front with those, you have to keep your real planes farther back, adding to the logistical nightmare that is combat.