And in personal lives, it’s good for those “That is exactly what you said 5 years ago, here’s the proof” moments.

In my field of work, emails serve as a history document for agreements and filing deadlines. We keep everything because we never know when one of our cases will require an email that proves x agreed to y on such and so date.

I have ~190k emails w/ couple decades of communication history and luckily every email provider since, well forever, allows for folders so my “inbox” stays near 0.

Dunno about this advice. . .