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Re:In MySQL, use “utf8mb4” instead of “utf8” (2016) by outworlder on Wednesday January 12, 2022 @02:49PM (#29911897)
Keep in mind that that's a post from 2016. PG has made many improvements since then. Upgrading is a much easier job right now.

Also, it's strange to conflate PG with Debian issues.

Re:In MySQL, use “utf8mb4” instead of “utf8” (2016) by Spivak on Wednesday January 12, 2022 @07:18PM (#29914914)
I mean it's not really a Debian issue when Debian's design decisions were informed by the lack of automatic online upgrades at the time.