Trying to force people to play something they dont want is inherently wrong and they need to stop doing it. When you think about it abilities like defy are already weaker when used by warframes like banshee so getting even less armor from it is inherently unfair to players who want to use it. And abilities like roar get used anyway because they're still meta. The only way to prevent widespread use of an ability would be to make the ability useless so the nerfs don't accomplish anything other than being unfair for certain warframe combos.
I think the intention behind those skills was to give alternatives other than JUST using the mods that accomplish a similar goal like you described. Not everything can be meta, sometimes things are added as an alternative option some people might find more convenient for their particular build.