tonyFair point on the first part, but our real focus is near the skill floor of the game. We don't provide perfect answers because optimal play is not what we are trying to teach. We first need to teach them how to play at all and that's always been our focus.
This is an important distinction because half the battle is getting someone in the server, and I'm a believer that you cant even begin to teach people what advantages are, pushing vs holding, even the most basic of things if they aren't even comfortable in a server comming with 6 people on 6s classes. Newbie mixes and tf2cc seem great as not only a really easy place for people to do that but also serve as a kind of monolithic place you can just tell a pubber to go to and the rest is taken care of.
The learning past that, when you actually start to pick up on the intricacies of 6s, seems to be severely lacking with a bunch of random guides in random places. So, unlike the case with completely new players where you can just send them to tf2cc or newbie.tf, they have to already know about a certain guide or video, in which case they'd paradoxically already know the contents.
I think just a basic aggregate site with some limited searchable tags that compiles all this hidden wealth of info into a more approachable collection would do wonders instead of needing to know a guy who knows a video. Some of the vids posted here are ones that I didn't even know existed even as an established player so even though the info they have is way better than anything I could've passed off to a beginner myself, I couldn't have even recommended them, let alone learn from them myself.