Just my opinion, but DA triggers should be pulled straight through with no staging. I used to stage because I thought it was the only way I could get small groups with a DA trigger, but then I realized that wasn't the case. Once I got the hang of pulling a DA trigger straight through I found I could shoot better, in terms of both accuracy and speed.
There is a trick to it, though. The obvious part is to pull the trigger straight back. The not-so-obvious part is getting the speed right. You want to move the trigger fairly quickly, but not so fast that it disturbs the sights or results in jerking the trigger. It does take some practice to get the hang of it; dry fire helps a lot. The problem with using a too-slow DA pull is that 1) it requires a little more physical effort, and 2) it actually makes it harder to keep the sights aligned properly.
I think staging is bad technique. But if people want to continue shooting by staging their DA triggers, that's up to them. I just think they're cheating themselves in the long run.
Again, just my opinion.