I don't much care one way or the other, as I know very little about IV's and their impact, and I have only very recently started looking into EV's. It would make things easier, I suppose, but I highly doubt that they will become visible. As stated in previous posts, this isn't what the game is truly about, so it shouldn't matter much unless you have a specific way of training or battle competitively (and that's what the internet is for, at least in my mind). What the games are about is bonding with your pokemon and having fun; if you achieve that, then IV's and EV's shouldn't be all that important. That is the reason I don't care if they're visible or not. If I catch a pokemon that I like and grow attached to, IV's, EV's, natures, and even abilities will mean absolutely nothing to me. As an example of what I mean, I will use this personal anecdote: I have caught exactly one Absol (my favourite pokemon) in my time as a pokemon trainer/gamer. The reason I only have one is because that Absol is mine; he is my pride and joy, and I am glad to have caught him and taken him with me through four games and all (main) regions so far. His nature doesn't matter to me, I have given little thought to EV's while training him, and he has the ability pressure, the least useful of the abilities an Absol can have (in my opinion), yet none of this has any effect on how I view him. If I truly wanted to, I could use what I know about EV's, IV's, and natures to raise an Absol that's twice as strong as the one I have, but I would consider that a betrayal to him at this point. Enjoying your time and loving the pokemon that you have, that is what pokemon is to me.
So, in summary, I do not care. It's the experiences that matter.