Funnily enough, I was initially appauled by the idea of EVs when I first found out about them in RSE and vowed never to play Pokemon again o.O
^This is my case, sorta.
I knew they were around, I just didn't really understand at the time. Granted the concept is a little hard to grasp for some people.
But it wasn't until I battled online through Diamond with my friend that I found out the hard way. Ouch. I got thrashed, big time, and so did my pride.
But, I learned about EVs, then I learned about IVs a little bit later. I EV train now, and I also look for good IVs, but IVs aren't as important to me.
Someone earlier mentioned something about still playing for fun. My Pokemon's IVs aren't flawless by any means. I just try to get the best possible in the right places. To heck with the other stats if I'm not gonna use them. It makes my Pokemon unique, and makes them mine, you know?
Another factor is that I play only using the shinies I chained, bred or SR'd. It makes it even more sweet when I win this way, but since I don't mind losing anymore, it doesn't really matter. But all this still makes it still feel like me, and still makes it feel like I'm playing the game old-skool.
That doesn't mean I'm not as competitive as the guy sitting next to me. I'm one of those people who wants to play Brawl with items off. Bring it on. It's very fun to try and outsmart my opponent, which with the above details, I have to do it a little bit more to win. I'll probably lose by just a little, but I remember that my Pokemon are far from perfect. But those irregular IVs help keep the "fun old-skool" part in play. There'll always be someone better than you are, anyway.
Now that I've learned about IVs and EVs, do I regret it? Not really, because now I'm not being sidelined. I can actually participate in the game without getting totally thrashed. And somehow it still feels normal.
When I play through a game for the first time, do I think about EVs? Yes, but it's not going to ruin my experience. Do I think about IVs? Maybe. I may glance at the stats, and nature, to see what they're like. But I don't put too much thought into it.
Do I wish EVs/IVs didn't exist? Actually, not really. It seperates the boys from the men. You can still play little league without knowing that stuff or your could graduate and still be able to play competitively.
Unfortunately, my friend is a major casual...
He loves Pokemon. But sometimes we do not see eye to eye at all. He likes keeping his Pokemon in NFE like Charmander and stuff. He doesn't have a clue what EVs or IVs are. I could sweep his whole team with just my Roserade. He likes playing Brawl with items on. That's ok, but it can frustrate me a little.
I want to win. He doesn't have a clue how to do the advanced techniques, and I don't think he'd want to learn. When I talk about them or playing with items off, he pretty much becomes a spoiled brat and calls it stupid, among other things. It's kinda annoying and I have to bite my tongue to keep myself from getting into a full fledged fight with him..
But I see a little bit of me there, too. The me that was before. The me who didn't have a clue. But the thing is, is that I'm still having fun playing competitive anything. I have fun winning, but I don't mind losing.
So no I don't regret learning about EVs/IVs. I did at first, but it really, really opens a whole new door on things. It expands the life of the game.
But I do miss playing with any Pokemon I want to, like in the old days. But as mentioned above, I still do! I still play with my favorites. So it doesn't make that much of a difference.