Interesting. I've been microwaving water for 4 decades and never had water explode anything. Also when I actually do have tea, I put the mug in with water in it, microwave it, then drop the tea bag in. Works fine. When I used to drink loose leaf tea I would microwave the water and then pour it into my travel mug that had the holder for the loose leaf tea so it would steep in the travel mug.

I found tea was hurting my stomach years ago, though, so I stick with coffee. I'll still have tea if I go to a restaurant and they have oolong though. Love that stuff.

The superheating thing is only an issue if you way overdo it. If you're that worried about it you could just put a tiny scratch on the inside of the vessel or toss some microwave safe anything in there.

Kettles are just easier and faster.

I have boiled water in the microwave my entire life and not once has the water exploded.

Microwaved water isn't "incredibly dangerous". That is wildly exaggerated. You only get that boiling seed point issue under very controlled circumstances. There is nothing "fucking weird" about it too. It is just EM being used to wiggle molecules. When you heat something on a stove you are also wiggling molecules. It is actually safer, biochemically, than, say pan or oven heating because it doesn't char the food.

Not just commonwealth though, mainland Europe uses kettles too.