Earlier quoted context omitted.
Bitter tannins are what you want in black tea, they're smoothed out by milk but a good cup needs to be grippy in the mouth. Black tea made with anything less than boiling water is usually not very nice, in my experience.
100% this. Which is why, as a Brit, my heart still sinks when ordering tea in most European countries: nine times out of ten you get a glass of once-boiling water to add a teabag to.
Milk is a factor. Weirdly for a country with a robust approach to pasteurisation, French milk is insipid.
In China, I couldn't even get hot enough water for coffee. The places I stayed offered water almost cool enough for a bath. I had thought I was clever, buying ground coffee in Beijing, but I might as well have carried a bag of sand.
Hey ho. Travel without privation is merely holiday.