You can be happy with something and still see ways to make it better. I love 5E, I think it's the best edition of D&D ever by a country mile, but I can see right away some things I'd like improved; why is there "no point trying to appease" people who think the Stealth rules could stand to be polished up some and sorcerers need more cold spells?Anyone who thinks 5e needs a Revised Edition is someone who will never be happy with any gaming product, ever. There is no point in trying to appease such people.
Now, as far as balance issues go, those are going to take a while to shake out. While I'm as eager as anyone else to debate 5E game balance, it's far too early to make up a definitive list of issues. I'm confident there will be issues, but we don't yet know what they are.