Earlier quoted context omitted.
Some people like cold brew, others don't. I fall into the latter camp. Then again, the only things in the cold-water path of my machine are: - silicone gaskets - silicone grease - PTFE - silicone tubes - clear plastic water tank As for the hot path: - silicone gaskets - silicone grease - aluminium - steel - copper - brass - PTFE (in contact with steam)
I think Coldbrew is even more dependent on what coffee beans and roast you use, we have tried a few and they are very different. But so far I liked them all. Maybe you preffer the bitter taste of cooked coffee? That is something that is missing from all our tries with coldbrew.
Definitely not.
But the thing about cold-brew is that it tastes mostly sour to me and nothing else (which is unsurprising given our taste-buds are most sensitive at higher temperatures, and proper extraction of coffee can't happen at those lower temperatures as some compounds just won't dissolve at the same rate, and sour compounds in coffee dissolve the fastest). With warm brewed (+ warm drank) coffee things are more balanced (not just straight sour) and you get the interesting flavour notes from the bag.
I don't think the quality of the coffee I am using is the problem. It might be the variant, but I enjoy natural light roasts (and light roast is already difficult to brew without it getting too sour).