Society is opposed to private, fragmented circles ("some" audio engineers, "some" people), subset communities contained in society. Externally, society as opposed to other societies i.e. countries or cultures.
Then one day some r/Iamverysmart self-proclaimed intellectual heard "societal" and liked the word, emotionally, and began using it — that's how you learn words, right? By using them. Trial and error.
So, so many errors.
But others liked it too. And ever more. Lovely errors. And suddenly because people confused it with "social", it began an "umbrella concept" for "everything involving many people doing stuff together". Sure, that works for society and social matters. It's also as empty a concept as you can make. But in the Twitter age, it's OK to use 1 word to mean 20 things and never detailing any of it,
because fuck.
Agreed.
The truth is so few people care, it's not even worth the time to delete -et-. Those who do care, speak with others who understand, and ignore the rest. Sad state of affairs, but I've grown convinced it's just human nature, and has been virtually forever.
[1] https://www.persee.fr/doc/rfsoc_0035-2969_1991_num_32_4_4079
Pet peeve of mine, there also was the word "sociétal" used instead of "social". Which led me to use the locution "les réseaux sociétaux" because fuck.