All good points.
I start the clothes dryer (air fluff), all bathroom exhaust fans and the stove vent hood (if it exhaust to the exterior) before I scan. I have rarely found it necessary to use a blower door (but I will if they don’t have these).
I do not try to do a rigorious, quantitative test (and defer to a better guy, if needed) as part of a home inspection. Generalists, not specialists.
I do take into account the wind speed, direction and all that.
In this particular case (this was just a case study, for iNACHI board education) the clients were complaining that this particular bedroom (their 9 year old daughter’s room) was always cold.
I was addressing, and trying to answer, their particular concern, not quantitativly test their entire house.
Besides, this was the only room that had that wooden trim around the rim joist area. Given the usual constuction techniques particular to this area, I knew that most of these types of houses had this problem (improper or not taping of the Tyvek.
On most Sundays, I cruise the new developments and check out what the contractors are doing (or not doing). In this way, I can learn the latest scams and defects.
This was just part of a regular warranty inspection and I did not want to have to charge the client for a full blown pressure test.
Hope this helps;