system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why does it make a difference in taste, if the water I brew tea with has boiled or not?

It's the other way around with mate: if the water hasn't boiled the mate tastes fine, if it boiled it's spoiled.

What does boiling do to the water?
gpt
It's about temperature and solubility. Coffee is the same way, you're toeing a fine line with certain flavor compounds that come out at certain temps.

For instance, if you boil the water, once it's all mixed in with the tea leaves it'll sit at say 204F (95C), this is hot enough to get all of the good flavors out of black tea, but in mate will draw out bitter compounds, if you use water that hasn't boiled and it's steeping at 190F (87C) then it won't be hot enough to draw all of the  desired compounds out of black tea, but will be perfect for mate because it won't draw out the bitter compounds.