I have my problems with the way 4E was structured, but this specifically is not one of them. That's just a resolution mechanic, and the only difference between forcing a save and, for example, making a skill check is whose ability is in question. If I make a skill check, I am specifically determining whether I am good enough at what I'm attempting to pull off the desired result. If I force a save, it's a given that I'm skilled enough; the question is whether or not the target is good enough not to be affected.