I mean I don't disagree with the idea behind what you said, but we do have search. You don't have to read the man pages like a book to get use out of them.
I'm willing to bet this is quicker than finding the question on stackoverflow:
People learn and use tools different ways. I'm a reference person, it sounds like you are too. But there exists a lot of people who find references hard, but example driven stuff easy (whereas I find examples limiting, and references endlessly useful).
Search for those people is difficult, as it's phrased by "this thing I want to do", and not "these keywords I already know".
tldr isn't for you and I... it's for those who prefer recipes over references.
Like I said, I don't disagree, and I can see the use people get from recipes. And yes, you're right that I'm a "if I need to google it more than 3 times, I'm reading the man pages" kind of person. However that stackoverflow answer is literally a copy and paste from the man pages, with an example (which the man pages I have also contains apparently). The information is the same, the method to search for it is different, but I'm willing to bet my way is faster ;)
I don't see anything wrong with tldr, I would have definitely loved to have something like that in the past. I do think that completely ignoring the man pages is a mistake though, since it requires just as little if not less effort as looking it up on stackoverflow, which in this case has the same answer anyways.
I'm willing to bet this is quicker than finding the question on stackoverflow:
http://paste.click/HrdrGW
And there's even an example.