"But that doesn't mean the ancient beer wouldn't bee good, I think we just won't ever know."
I think we can be sure that most beer was crap in the good old days. Don't believe it, try brewing without a thermometer, sanitizer, yeast, electricity/propane and stainless steel. Get your water from the nearest creek, river, pond or lake. It would probably be a good idea to pee in the water to replicate the good old days lack of sewage treatment. If there were sewers, somebody else's untreated "discharge" was probably just far enough upstream to not see "floaters."
People will eat, drink, smoke, and inject anything to kill a few brain cells.