I should be able to understand the value of the massive census index between 1836 and 1936 (Industrial Revolution, economic statistics, etc.).
However, for genealogy and history, data from the late 18th century and the first quarter of the 19th century (post-Revolution and the Napoleonic eras) are missing. For Alsace-Moselle, there are also gaps and omissions between 1870 and 1920. Indeed, I imagine no provisions were made to integrate data written in German or names that were “Germanized.”