> and half the world that does pin is probably pinned to Let's Encrypt

To be fair, unless I'm misunderstanding, wouldn't this be a good move?

LE has a good security record and takes itself seriously, versus these smaller CAs that seem to mess up regularly.

All your eggs end up in one basket usually because it's a really good basket.

All things turn and curve and degrade; Google used to be the "it's perfect" darling.