Didn't you have to learn what builds are better than others? How did you learn that 14 is too low for a primary stat? I'm betting you learned it organically, through trial and error.
Yes and no.
Some concepts I did discover for myself. Others, I read about them on the net. However, I didn't blindly follow them (regardless of whether they resembled or differed from my own gaming experiences). I then engaged in constructive debate with many other posters no less learned than myself, and in the process, learnt much more about said aspect of the game than if I had played it myself.
I would then proceed to implement the new knowledge I had picked up in my subsequent games. If they worked, I could then use that as a springboard to test out other concepts based of it and in turn learn newer concepts. Concepts I would likely never have a chance to actually try out if I was still stuck figuring out basic concepts such as how best to allocate my stats or what race complemented which class.
If the idea turned out to be a dud, I would then report my findings to the forum, igniting another wave of discussion. That idea could then be refined or rejected.
Either way, knowledge of the game is advanced. The process repeats.
Why shouldn't he (our now theoretical player given the lasted update by the OP) get the chance to experiment? To try? To fail? And to later succeed? Doesn't success after failure make you feel even better than just success alone?
Do you think a computer company today figures out how to build a PC from scratch with no prior knowledge and completely shut off from the world? No, they take the best in the market, reverse-engineer it, improve upon it and come up with their own model.
It is just plain more efficient, and leaves the player with more time and resources to try out more meaningful and advanced experimentation with his character. The player doesn't learn anything meaningful from discovering that a 14stat is too low for 4e.
Why do you think dnd knowledge has progressed so quickly? People were able to quickly latch on to key fundamental ideas proposed by others, and either build upon them or reject them using contradicting findings (which in turn lets them branch off to newer findings). Thus, they were able to do a "rise above", to use knowledge building terminology.
Through such knowledge building, people are able to discover newer findings much more rapidly than if they each had started off from scratch.
The information you need is already there. Right in front of you, a mere mouse-click away. There is no reason to take the longer route and find it out the hard way.