Google had a feature in gmail for a long time that automatically sorts your email into categories like Promotions, Social, Updates, Forums, etc. It was automated and fairly effective imo. If you try to disable the 'smart' features they will then disable this categorization retroactively and dump thousands of emails in your inbox and then nag you about turning it back on.

I’ve clearly had it turned off for years(?) and I’ve never had it nag about it.