What happens if he doesn't drink for a night....or three?? I do evaluations as part of work screenings, his daily use would be a red flag. He is, at the very least, abusing alcohol. No one needs to drink that amount of beer every night.
Here's the thing. Can you ask him to stop or slow down? The first thing we learn is we didn't cause it, can't cure it, and can't control it. So if he does have an issue (and I would offer his daily consumption is an issue), there is nothing you can do about it. If it's not a problem for you right now, then I guess it's not a problem. It may become a problem for your family down the line. But we all learn it's one day at a time.