I did get an email, but it was triaged under the update category inside Gmail and thus buried under a metric ton of other updates (the account is over 14 years old and it has accumulated a lot of crap over the years).
That's totally on me for missing it. On the other hand I only follow a couple of RSS feeds, so it's a notification channel with a far higher signal-to-noise ratio for me.
Even though the renewal app runs as a cron job weekly, it occasionally breaks due to OS updates or some other issue so the email from Lets encrypt that warns me at least a week or before the expiration has been fantastic.
https://letsencrypt.org/docs/expiration-emails/