The overwhelming consensus online is that microwaving a babies bottle can be "dangerous" because microwaving formula can produce hot spots. However, if you simply swirl the bottle you can even out the heat distribution and eliminate said hot spots. The amount of bubbles produced by swirling is minimal and heat redistributes very easily in liquid. That being the case, if I test the formula's heat and its a good temperature, and the heat is redistributed, whats the big deal about microwaving the bottle? Is it just that people can't be trusted to swirl the bottle well and test the temperature?
Anticipating the argument; if your afraid of the plastic bottle giving off chemicals, then its also unsafe to sanitize them in the microwave.
Edit: We are using a formula without probiotics