My initial thought is that this could massively increase the altitudes attackers would come in...
If you think you are having a 1v1 in the Main Arena, your SA has failed you.
Why ruin the surprise
I suppose it's not terrible just coming in at 20k all the time.
I do... (and I have said before) If for no other reason but to watch the score monkeys mach buffet all the way to the deck when I show up co-alt... Then I get 10 minutes before they are back on their perch at which point I am under 10K and they won't come down
Yes, I think so but after the initial go, I would think most would leave the alt monkeys up high and just go under them.
Did the Home Front radar in Britain tell them the altitude of the incoming Luftwaffe?