Aluminum is actually recycled, and should replace PET for all drinks packaging
To the best of my knowledge, no one has made a resealable aluminium can. Until that is solved aluminium is inferior to PET for many use cases. In fact this is the primary reason I hardly ever buy soda in cans.
In Japan they are very common for canned coffee, I dunno if it's because plastic bottles are unsuitable for warm drinks or something? (the drinks are kept hot ready to drink in the vending machine/store aisle)
