I shouldn't have to elaborate, but maybe I do.
Just so you're aware, I have the turbo motor with 5W-30 oil. 5W-30 is rated to flow to as low as -22°F.
In case you missed it, I gave two scenarios above. One for normal conditions where I start driving when Mazda's AWS brings the engine down to its normal idle. Extended warmup time is not necessary.
The other is for days like today, when it's -20°F. We're on the bleeding edge of what this oil is capable of, so I'd much rather make sure its circulating a little better before I give the engine a load. There is greater risk from carelessness than giving it an extra 30-60 seconds in these conditions.
So I've done two things to help out my car: one is described above. The second is that I'm using Pennzoil Ultra Platinum which has the best cold flow property of almost any oil on the market.
There is no need for further pedantics. I think I've explained my position well enough, and won't post here again.