There's nothing good about base 3-4 defenses anymore than base 4-3 defenses. Both get schooled more consistently than defenses built to disguise blitzes and coverages.
Niners, Ravens, Rams, Chiefs... the one thing they have in common is constant disguises in their blitzes and coverages. Disguises are a bit easier to do in a 3-4 if you have the right personnel. But on the flip side of that, 4-3 disguises tend to have a better-performing front line.
So, I'd like the focus to be shifted more toward disguising the defense well.