I've worked a few times in Germany for onboarding new teams for a company I worked at previously. It's pretty normal to have some lunches with a beer, beer is a very cultural thing for Germans and having a beer during a lunch out with the team is completely normal, no one is impaired, no one is drinking 2-3 liters of beer in one sitting. Even here in Sweden where alcohol drinking is much more frowned upon I've had lunches (usually on Fridays) with my teams where we would have a beer or two.

There are very different degrees of what and how much to drink, it can be a socially responsible and enjoyable activity, it's relaxing to let go from the whole super-professional office culture and have a beer and cheers with colleagues.

The world isn't black-and-white.

This comment belies a misunderstanding of how alcohol affects the body - that it merely creates a gradient from "not impaired" to "impaired".

Clearly there is more to alcohol than just impairment. Alcohol is both a stimulant and a sedative. It's widely recognized as a social lubricant. All of these properties, in moderation, can be beneficial to many kinds of work.

Some people do enjoy the taste, or the warming feel you get. I will sometimes have a small glass of whiskey in the evening just for that sensation, not to feel any intoxication.