[dmortin]

And sometimes automatic updates break and then the site may be down until you find the problem which may require much reading and therefore a longer time if you don't deal with sysadmin stuff often.

With PaaS it's someone else's job who does this every day.

[joosters]

...so someone else can install the updates that break the server? Check your SLA, no cloud provider is going to pay you much compensation when the service goes down

[chillfox]

If you stick to LTS releases and stay away from Oracle/Java then you are highly likely to never have OS updates break the application.