Not for tea. There is a substantial difference in flavour if the water isnt boiling. It's one of the shocking things a british person experiences in america, handed tea made with a microwave. It really is quite disgusting in comparison.
I think it's more that no one ever actually boils it. They microwave it to drinking temperature. I'm not sure it would be safe to boil it in a microwave, the water would go everywhere.
Microwaves don't always superheat water. I find that when I'm making an individual cup of tea, it gets superheated far less than half the time, and even when it does it doesn't react violently enough to the introduction of the tea bag to be a concern.