This should actually go without saying. Why on God's not so green earth would you hide such an important feature behind an obscure and unwieldy cheatcode?
I didn't find tegidcam very good, certainly not very easy to control. I would LOVE a first-person camera that I can control smoothly for doing videos and just for looking around and admiring my zoo. One that feels like I'm strolling around my zoo and allows me to easily make turns so I can look left and right.
I am afraid, this is the reason, why FDev is hesitant to implement a first-person camera in the first place. If they would commit themselves to such a camera as full feature, they would have to optimize it: smooth control as mentioned, collision detection with objects & guests including inaccessibility of certain terrains. This is probably a lot of work.
If they just keep it as an “easter egg”, a fun but almost unofficial gimmick, they can leave it as is, included all wrinkles and irks.
I still believe, they should do it.