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Because some of these idiots (myself included) are interested in chasing the best possible cup of coffee. That requires grinding high quality beans at the time of brewing. That's just the start though. There are seemingly endless rabbit holes to go down in this pursuit.

If you're not into that then yeah, get someone else to grind ahead of time.

No. If you're going through 12 ounces a week, you might as well let them grind it for you.

I suppose you could do the experiment: get next week's coffee a day early and compare it to the last dregs of last week's coffee. I bet you can taste the difference if you really look for it... but I bet the differences are too small for you to care about.

Great idea for an experiment

It's fun having the ritual of grinding coffee. Maybe I can't tell the difference but I enjoy it!

Keeping the grounds in the freezer attracts moisture to the cold grounds

You lose some aromatics immediately on grinding and much more rapidly from ground coffee than from beans so grinding right before brewing preserves as much flavour as possible