Also, Swedes go on cruises to Åland (a Swedish-speaking Finnish island with low/no alcohol taxes) and famously bring huge suitcases to fill with booze.
I took one of those booze ferries in college from Oslo to Copenhagen. The drunkest I got that whole semester by far was our trip back. But my favorite was the old ladies with boxes of hard liquor and packs of cigarettes getting off the boat
Beer is actually cheaper in Switzerland than France, less taxes. As someone who lives on the border, I buy all my booze in Switzerland. Atleast in supermarkets.
Obviously swiss labour is much more expensive so in bars and restaurants its more expensive in Switzerland.
Used to live in CH and here to make the same point: as the taxes are low there, alcohol (and, surprisingly, big TVs back then) were some of the very few things cheaper to buy locally.
Do not think it changed now.
Restaurants, on the other hand, were some of the most expensive in the world there.
German alcohol taxes generally aren't bad, going to Poland or Czechia should mostly be about general shopping trips. The Luxembourg thing is absolutely true, but rather specific: In Germany you pay more tax per ml of alcohol the higher the ABV is and if you want to make your own liqueur you wan to start out with real high ABV and then dilute down, a litre of 96% is about 30 Euros in Germany, 20 in Luxembourg. Wouldn't be worth the trip for more pedestrian ABVs.
You can generally import as much as you want within the EU as long as it's for your own use, to not have to explain yourself keep the booze to under 10l per person.
German beer taxes are low, like 10ct per litre on average. Wine taxes are even lower because France exists, German vinyards do have a lobby and all they want is to make sure is that people don't get used to paying more than a fiver for a bottle or they might start buying import stuff.
Im origanally from the Czech boarder in Germany. We usally went to CZ for cigarettes and gasoline but the alcohol in shops wasnt really cheaper. Pubs or Restaurants on the other hand are really worth the trip.