Now I can't tell if you're simply moving the goalposts, or you actually believe that crap.
There are no absolute models that have be used in any list,
I gave you numerous examples of where that isn't true.
You didn't say "There are no absolute models that have to be used in any CODEX
." In which case I would only have had the three examples to prove you wrong, though I would also have pointed to the previous Necron Codex, where they only had one Troops option, and only one HQ option that didn't require opponent's permission to play.
Three examples? Why yes, Tau are compelled to take a squad of Fire warriors, and also to take a Commander.
I refrained from mentioning those extra two before because I didn't want to make you look ignorant. Ho hum. When you say something blatantly untrue like
Other than [The Emperor's Champion] no one model or unit is required to play a game from any particular codex. ...To say any model, besides the emps champ, is absolutely required to play a game from any codex is to rely too much on list building and not enough on tactics.
then the cat is already out of the bag.
Tactics don't determine your list, and the best player in the world with the worst list possible will still lose to a good player with a good list, irrespective of tactics employed.
Tactics are determined by what you face, and the terrain you face it on. Strategy
determines what you want to use, list determines how you get in the game, and luck determines how well you do with the things you have - these things are, more or less, equally important. Acting like your army list isn't an important component of the game makes me want to laugh and cry in equal measure.
Nipplewing, for future reference, is a list where Sanguinary Guard are selected as Scoring units, for which Dante is required.