For some people who aren't too picky, it might be a one-stop shop. Also true for some basics, like bread, milk, eggs, some produce, or common frozen stuff.

If you are looking for extra variety or less-common ingredients, you'll have to also shop at a bigger supermarket. But since we usually use cars in the US, it's not too big a deal to do both the same day

Aldi is barely a 1st stop. It only reliably has the barest essentials.

As a Kaufland guy myself I'm deeply disappointed you didn't mention them.

Aldi for the essentials. Then Too Good To Go for fruit and vegetables and bread/ pastries.

It could be one stop, but their produce and baked goods are bare minimum.

The meats are the most affordable around me.

When I have enough free time I shop like this. We don't have Aldi but we have Grocery Outlet. It's a discount grocery that has some reliable products but mainly over stock or discontinued labeling or some small flaw in packaging or product (ice cream with all the mix-ins at the bottom) or near expiry that wouldn't fly at a regular store. So you never know what you'll find there, for very low prices. Then I hit up Safeway, decent quality, where half the store is usually on some buy-one-get-one sale, then to the high end, employee owned, small chain where I can get farm stand quality meats raised a few miles away, high quality cat food and local produce.

Shopping this way saves about $400 per month. When I don't really have time (I work 72 hours per week, take online college classes and have elderly family members to look in on) I end up spending about $1000 per month on groceries at the fancy store.

because you can’t enter a 2nd one with a bag full of goods from the 1st one.

That's not an issue I literally do it all the time. Backpack, though.

Yes that's how we use it as well. Aldi is for staples and then we either do the international grocer or another specialty grocer. Not really a big deal at all, especially if you don't do your shopping all at one time.