Why is it that some people insist on making a pot of tea just big
enough to fill one mug? Is there any different when brewing a
bag/leaves of tea in a covered mug or a 2-cup teapot? Does the pot
maintain the appropriate temperature while brewing rather than a
covered, warmed cup?

Also, if this is true; since I only have a six-cup teapot, would it be
practical to brew 1 mug (2 cups) in my teapot instead of my mug? Thank
you in advance, I really value this group's help in getting me
interested in tea.