Memes

Indeed. According to a literary website from Lyon's library, the s was not pronounced in certain words well before we stopped writing them. Apparently it took a few centuries to introduce the circumflex.

Bien que la graphie ait longtemps gardé la présence de ce /s/, on ne le prononçait plus depuis bien avant qu'on ne décide, au XVIIIe siècle (dès l'édition de 1740 du Dictionnaire de l'Académie française), de noter cet amuïssement par le recours systématique à l'accent circonflexe. L'amuïssement du /s/ en position appuyante date pourtant d'après 1066.

Or in English

Although the spelling retained the /s/ for a long time, it had ceased to be pronounced well before the decision was made in the 18th century (starting with the 1740 edition of the Dictionary of the French Academy) to systematically indicate this elision through the use of the circumflex accent. The elision of the /s/ in stressed position, however, dates back to after 1066.

That would be very typical of French. Spoken French is well in advance on the written form. Hence the jokes at its expense.

Maybe in a few other centuries we'll have made a few other reforms to match what's written with what we're saying, but I think most of us kind of like that. The written form is the glue that holds all the varieties of French together and writing formal French also makes one feel a bit smug.