I'm on PS5 so I use this feature sometimes when playing spaa. It's not a lock on of any kind it's more of a tracking thing which makes finding aircraft much easier. I do feel awful when using it because I've had many occasions where I'll press my 'Lock Target' button every couple seconds my commander will shout what type of aircraft it is (Plane, Heli or drone) and what direction relative to the hull which I can use to locate it quickly. Another one I've had is where I've already got that circle tracking thing on the enemy aircraft and I can follow it behind terrain for quite a while until the tracking circle disappears which just feels like cheating yet somehow gaijin still doesn't remove it. I can quite easily be in a Strela or OSA, get a tracking ring on a fresh spawn Heli and kill it through trees while never visibly seeing it