A database with built-in HA is a significantly more complex system than one without it.
replyAnd one built without it and not coordinating with it is often much harder to reason about when you bolt it on later.
reply> Major databases now ship effective HA tooling
replyWhich ones? PostgreSQL doesn't have HA in core.
MySQL 8, but upon review that was 2018. 5.7 had some but it's certainly improved overall since then as well
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