This is purely anecdotal, but I am seeing far fewer replyallpocalypses than I did 10-15 years ago.

Everywhere I've worked email has slowly started taking a back seat to chat clients. Initially it was only email. Lots of Reply Alls. Then most of the places I went to use Google Chat and sometimes you'd just bring in multiple people at once. Hell or even a Google Hangout. Today most seem to go straight for Slack with email being secondary.

I don't think people care about email nearly as much anymore.