I suspect that if we take the average of e.g. the bitterness of the beers that you have been drinking, it has already converged to an average
Empirically speaking, you are wrong.
Perhaps, although I don't see how you can know that unless you have been making measurements, or unless it has definitely been going in the direction of getting more and more sweet, or more and more bitter.
In any case, since beer does not differ an infinite amount in sweetness and bitterness, it won't be easy to stop that average from converging sooner or later.
Another month, another rationality quotes thread. The rules are: