This isn't LE's decision: a 47 day max was voted on by the CA/Browser Forum.
https://www.digicert.com/blog/tls-certificate-lifetimes-will...
https://cabforum.org/2025/04/11/ballot-sc081v3-introduce-sch...
https://groups.google.com/a/groups.cabforum.org/g/servercert... - public votes of all members, which were unanimously Yes or Abstain.
IMO this is a policy change that can Break the Internet, as many archived/legacy sites on old-school certificates may not be able to afford the upfront tech or ongoing labor to transition from annual to effectively-monthly renewals, and will simply be shut down.
And, per other comments, this will make LE the only viable option to modernize, and thus much more of a central point of failure than before.
But Let's Encrypt is not responsible for this move, and did not vote on the ballot.
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