[BlackFly]

If you read the article, you will find out that you are only supposed to use the exception on historical names. Most people use it incorrectly and drop the trailing s any time the word ends in an s. Arguably for Bayes, he is historical enough that it could be appropriate, but that makes the rule even worse: at what point in time does a personality become historical enough that you must drop the s? I personally consider "historical" to mean: about the time of Archimedes, when a lot of people's names seemed to end in s.

In my opinion it is just better to keep the s as that matches how people will pronounce it and regularization of the language is better. Plus the misuse of the rule makes it even worse.