***Learning by getting killed a lot.
I think what people mean is that you learn by actually getting into a fight. Fight either someone better or more than one. You will get killed a lot, but you will learn a lot. So, it is true.
***TA/DA Skills
You can definetly play it safe and never actually put yourself in a situation where any dogfighting skills would be needed. If thats how you play then what ever you learn in 1 vs 1 training would be useless to you except for when someone else like y ou comes in a little higher.
If however you like to fight, SA (that you can learn only in the MA) alone cannot help you. You need to know what your plane can do, what you can do, how to dodge bulets, etc.
So, 1 vs 1 skills are only good only they fit your flying stile.
***Why you learn more in the DA/TA?
Easy to answer. You can get in over 100 1 vs 1 focusing on ACM only and not woring about cherry pickers etc in less than 1 hour. IN the MA you have to fly for 10 minutes to either get HOed, Picked, Ganged, or do those things yourself. It would take years in the MA to match 1 month in the DA with someone good.
***Why I would not recomend to anyone new to try the DA (TA is ok)
Well, its a game. Part of the fun is figuring it out. Once you do and you become good, you get borred. The reason I made it in here for 3 years is that I sucked for the first 2 (and still do)