I've done quite a few MySQL setups with replication. I would not call setup "extremely easy", but then, I'm not a full time DB admin. MySQL upgrades and general trouble shooting is so much more painful than AWS aurora where everything just takes a few clicks. And things like blue/green deployment, where you replicate your entire setup to try out a DB upgrade, are really hard to do onprem.
Without specifics it's hard to respond. But speaking as a software engineer who has been using MySQL for 22 years and learned administrative tasks as-needed over the years, personally I can't relate to anything you are saying here! What part of async replication setup did you find painful? How does Aurora help with troubleshooting? Why use blue/green for upgrade testing when there are much simpler and less expensive approaches using open source tools?