I can see your point to an extent about sanitation. But I don't know, Mark - I've always been pretty 'sanitation OCD' even back before my beers were consistently good. And I remember (pre-temp control) a lot of beers that were perfectly clean but overly estery and fuselly. IIRC these were beers where I pitched from 70-72F for the most part.
Yes, but if one is pitching at 72F and the ambient room temperature is 72+, one is looking at peak fermentation temperature that could possibly exceed 80F due to the exothermic nature of fermentation. Additionally, the culture becomes more active as the temperature rises, resulting in even more heat being produced.
I used to pitch ales at 70 to 72F on a fairly regular basis at my previous residence, but my basement was 66F and the carboy sat on a concrete floor, which acted as a heat sink. My wort temperature would drop to around 66F before fermentation kicked into high gear, and would rarely go above 70F due to the concrete floor sinking heat from the fermentation vessel.
One of the reasons why I hate plastic buckets is that HDPE has the lowest thermal conductivity rating of the "big three" materials that are used in the construction of fermentation vessels. Stainless has a terminal conductivity rating of 16 watts per meter kelvin (W/(m·K)). Glass has a thermal conductivity rating of 1.05 W/(m·K). HDPE plastic has a thermal conductivity of 0.42 W/m-K. In essence, HDPE traps heat better than any of the materials commonly used in constructing fermentation vessels.