Inane is actually a word. Its not used too much, but it means silly / stupid.
sorry about that, I was extrapoling first (because I found it insane :) )
instead of looking for the meaning of this new word (for me[which I discover is spelled the same in english {and few other european languages}])
ps: whilst my fr-english is quite bad to read, I noticed you have a typo in your last sentence: "but I also don’t love the idea of people having to learn such an inSane and archaic system."