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> I’m confident that the thousands of AWS/GCP/Azure/iCloud security engineers are all doing a more thorough job than you can

I'm not so confident about that:

https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=azure

It really depends on what you self-host.

https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=syncthing

"Do everything" solutions go against the principle of minimizing the attack surface.

EDIT: More is not always better in security. With more people doing more things, the statistical odds of miscommunication and misconfiguration increases.