so, I am pretty newbie on the whole thing, so I take my shot...
I just head some ideas floating around in the bath tube...
1) Donations, since many seem to use symfony professionally (as freelancers I guess) donations shouldn't be much of a problem. Altough, I must admit the donation button is quite good hidden.
Maybe everyone, who complained here did donate already a bit or even a huge pile - my apologies. I didn't donate anything so far, yet since I prefer donating to institutions that I know and helped, I guess I will go for it.
2) Specific "documentation requests" via tickets/forum. If there a specific problems and nobody can solve them and you are an experienced symfony developer - not some newbie like me - then there should be a way to find a solution and it should be documented properly in the forums. Maybe a subforum with the question/problem and result. Or on the main documentation page: Challenges + Solutions (in a wiki fashion?) ? (It kinda reads like many people solved many problematic tasks already.)
3) Probably combining 1 & 2?
so I am pretty green on this, yet, if I catch some flak maybe I learn something

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my view on the documentation (Notice: I only know the jobeet tutorial til day 13 + a few other days so far.)
My impression is that is similar to other tutorials, right there at the trenches, which is quite good in some ways, yet terrible for other things - from the trenches it is hard to see the whole frontline.
I basically miss an "overview", I can't see how the things work together. Symfony appears to be like many black boxes to me, which is okay, but I don't where these black boxes interact and which black box to use for what. I made some notices during the tutorial and now picking up some things, I hope I can provide such an overview. A friend you dug into a few frameworks had the same problem. Since symfony is that mighty and has high level abstraction it is utterly confusing for newbies what is going on from the joobeet trench.
so now I am back at watching Band of Brothers

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yeah, so much for the trench metaphors.