No, of course we don’t microwave the mug WITH the teabag in it. We microwave the teabag separately.
Surely stirring the water in the microwaved mug and giving it another round easily solves this issue.
Ideally 2 to 3 rounds, yes.
But at that point, isn’t it easier to just buy a kettle? It doesn’t require such manipulations, costs next to nothing and allows you to rapidly boil up to 1,5-2L (0,4-0,5 gal) of water for all your needs.
There’s a good reason most of the (Western, at least, dk about other places) world uses them and considers them a basic piece of kitchenware.
In the US, kettles are supposedly much slower than a microwave or even a hob due to their grid.
Microwaved water can sometimes explode after being disturbed by stirring or adding coffee/tea bag: