Firstly, YES, TFC mapping is quite flexible and YES, lots of people still map for TFC.
I noticed TWHL's side bar has a "HL Entity Guide" and a "CS Entity Guide", but no "TFC Entity Guide".
If you look up any TFC entity (such as info_tfgoal) in the "Find: BLANK in "Forums/Entities/etc" it does indeed display them, and clicking the "TFC" before the entity name takes you to an index of them.
So just for the sake of consistency, why not add TFC to the navbar (and while you're at it, more entity specificness)?
I'm sorry, but CS seemed like a step DOWN from TFC in terms of how flexible entities can be, yet it gets more notability.
Come on. Just be convenient.