Speaking personally, it would be safe to say my career successes are defined by ignoring warnings like this and doing something from scratch anyway.

So I completely agree, and I guess this FAQ answer is really meant to talk to the casual developer who doesn't know what they're getting into. The person who does know and does it anyway will (and should) ignore stuff this like. I don't think it was meant to be condescending, I took it more as a joking tone but with a real warning that it's a long road, which is true.