"The tac reload has gotten so much flak and frankly I don't understand it (the flak) why on earth would you leave a partially loaded mag on the ground (unless it malfunctioned?)"
From what I understand, the argument against the tac load is this: It is an administrative proceedure. It isn't something that you do in the middle of a gun fight. If there is a lull in the gunfight, then OK, top off the gun and keep the mag, but when you have known targets and you are behind cover, this isn't the place for a tac load. If you do a speed load and have the opportunity, you can squat down and retrieve the mag. while keeping the gun and eyes on the danger area. Another side issue is that IDPA is supposed to be training for real life gun fights. Most real life gunfights don't involve huge round counts and multiple mag changes. However, IDPA wouldn't be fun if we neutrilized a single threat with a single shot or a hammer and the match was over. So, we have a higher round count to make it a match. Now in a real gunfight, I don't really think you would be making tac loads, I may be wrong, but I doubt that I would. I would be shooting until all known threats were down. This would almost certainly involve primarily reloading from slide lock.
I personally can see both sides of the argument. If it came down to me making a choice, I would forget the tac load. However, I am neither a gun fighter or a serious IDPA shooter.