Right?
"Oh, so Oolong Orange Tea brews best at 136.7°C for exactly 28.3 seconds of steep time, so I heat my water to exactly that and pour"
Ok, cool. As soon as you pour you're losing heat to the cup, so you aren't actually brewing at the optimum temperature anymore, so stop faffing about with this bullshit.
Probably got three people in the entire former British Empire that do it correctly with the temp loss of everything accounted for, one of them likes to murder people the third Sunday of every 17th month but only when the moon is full and covered by clouds, the second one is batshit insane, and the last one is rich enough to be able to do that.