Why? I don't know.
With "Timed Objectives" all you're really doing is deciding how many turns after you capture an objective/flag etc. you have to hold before you start getting points.
To the end of your post. seems to me what your describing is the AI having units acting as an "
overwatch" to engage any enemy units trying to interfere with its units advancing on an objective.
That is something many of us "lowly" humans wished we had not forgotten to do ourselves a "
time or two".
Just me being well, me

this would probably be a good time to recommend to you that the game manual might be useful to clear up some of these questions and I would "
blend" that in with a good measure of just playing the game at your local "
school of hard knocks" best part there is
no tuition involved since admission is free!
Regards,
Pat
