Aformentioned (hilarious) hand-slapping edit aside, at least the four mentioned DVDs keep the focus on the band and the performance(s). Compare to the recent few Paul McCartney live DVDs for example and the endless cutaways to singing-along audience members. I want to see Brian and the band performing the music and all four of the DVDs do a good job of it, really it's not a big deal that they chose the best performance of each song.
Its not a big deal and the very same technique was used with live albums for many years....taking songs from different concerts to end up with the best possible combination of performances. Its just that on an LP you're less likely to notice unless the liner notes mention it...whereas on a DVD/video you could tell quite easily.