This thread is almost as amusing as a “beans in chili” thread! ��
I wonder whether she had ever really researched the subject. The U. S. Navy, for obvious reasons, has done this a few times. Last time I checked, many decades ago, they had again concluded that any reasonable number ('teens) of cups had no negative effect.
I use a French press, because it makes the right amount of coffee (about a quart) and is easiest to clean. Also, all glass and stainless. I don't mind the mud in the bottom of the cup. If I did, I would be more careful pouring it.
I still don't know what the heck I am doing, and expert advice is always appreciated.
It was more of an issue with my acid reflux than anything else. The screen in a French press needs to be pressed down slowly or you will get grounds slipping through. There will be sediment regardless, but I feel it makes a richer flavor. Course ground coffee only. Use something like "drip" is asking for trouble. I'm sure there are dozens of YT videos on how to use a press, but like everything else on YT, dozens of different opinions also.
Are you a coffee snob too or do you accept and drink the cups and envelopes?
Keurig here, just me. Dark roast, smallest cup size. Don't like my coffee really hot so I add a little cold Coke to it. If its afternoon maybe a bit of JD too!