Um, it’s not about the carb, it’s about the OIL.
Bingo!
You got it : it’s important for the oil to circulate back up to the engine.
That's what I always believed. I start the engine, then let it run for a minute or two to get the oil out of the pan and into the engine and transmission. Then, I drive away. If it's cold, by the time I'm on the main road, the heat's working (but my coffee's already been helping with that).
Actually the carb had something to do with a warm engine. I’ll admit I no longer work on cars but I once replaced my cast iron intake manifold with a performance aluminum Edelbrock.
Part of the channeling of the manifold carried hot exhaust gas under the plenum to insure gasoline droplet vaporization. There was a thermostatic control valve which regulated the hot gas.
Watched our liberal down the street every morning going to work at a college theater....1.start car and 2. let out clutch and speed engine to take off up the hill. All in about 3 or 4 seconds tops. EVERYDAY. -5 temps or 75... Was about 3 yrs and he had to get rid of the car. No Joke.