Coffee grinder hype and buyer's remorse
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Nowadays I just use a cheap single speed grinder that works great. [1] I can not envision ever spending more than $19 for a grinder.
[1] - https://www.amazon.com/Brentwood-CG-158B-Coffee-Spice-Grinde...
I'm sure if there is hype for "high quality" beans. What do you think? We don't drink much so price is not a big issue.
High quality beans really are a big difference. It's not just hype. However, the differences are heavily muted by milk, so if you're just making lattes with it it may not be worth the effort.
(I enjoy lattes anyway. I have a cheap frother from IKEA.)
Pre-ground beans are actually just fine. It's just that they go stale kinda quickly. It might help to keep it in a vacuum seal in the freezer (though honestly, people disagree on the merits of that). But it's easy enough to spend a few minutes grinding by hand right before you brew.
The main thing here is that you get to enjoy the differences. It's not so much that one coffee is better than another, or one brew time, or one grind, or whatever. Coffee is interesting because there are so many differences you can note in just beans and hot water.
If you're not interested in exploring that... well, you'll still be happier investing in high quality beans. The difference there really is enormous and you don't need to be an expert to taste it.
If you're not into that then yeah, get someone else to grind ahead of time.
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
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.