Why are non-globalised beers different?

Ceremonial drinking scene on a seal found in the “Great Death Pit” in the Royal Cemetery at Ur. In the top register, left, a man and a woman use straws to drink a liquid, probably beer, from a large jar on a stand between them. On the same level, right, sits a figure, likely female, raising a cup before a standing figure, possibly a servant. In the lower register, a woman plays a bull-headed lyre, in front of which two dwarves dance. On the far right, three women clap while dancing(?). On the far left, two women, perhaps with musical instruments, stand in front of a man with a staff.