Are you going sarcastic? Because I believe I don't deserve that... If my posts are too many, or too annoyng, or too stupid, please use PM and let's clear it. I've noticed that you answered on bearly 30% of my posts lately... If there is a problem, I believe we can manage it.

Nonono, do not misunderstand me!

I really appreciate your testing, and troubleshooting, and really deep questions!
If I ask a real FCO about your questions, they usually say, "we never do that, as it was forbidden".
Simply it takes more time, to answer your advanced questions, as it needs to look inside circuit diagrams, to find the right answer.

If I do not answer at all, that either means that we were unable to find it out (and waiting somebody in the forum to answer it), or I simply forgot it.

... if a missile launched in UPR, and the target descends, than the system will guide the missile as T/T.
What could be the purpose of such sort of behaviour?

Lazy FCO behavior.