It'll be more nefarious for industry, as you've probably observed from self roasting, roasters might all be roasting dark to "blend" in more inferior beans for uniformity
This is absolutely true, and for Starbucks, it became a practice to over roast the beans in order to give it the robust flavour, even with inferior beans. I know this isn't a popular opinion, but I think Starbucks' coffee just tastes burned. I really don't like it.
I don't roast to that limit, and one of the things I roast is a blended bean, so it is virtually impossible to roast it that much. Different bean types take different amounts of roasting to be over done. I like to experiment, and I have definitely over-roasted my coffee. It's a really, really fine line. Like when doing about 3/4 of a pound at a time, the difference 30 seconds of roasting can make is astounding.
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