In retrospect, it's been very confusing to people that both "DST Root X3" and "Let's Encrypt Authority X3" have "X3" in the name and expire around the same time. If nothing else, it'd be good to try to avoid that confusion at much as possible in the future. I might suggest that the next ISRG Root (as I'm assuming another one will be needed at some point), probably shouldn't have "X3" in the name despite it being the logical next choice.
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