You shouldn't have to, sure, but I think we've seen a monotonic progression towards the expectation of work-related availability outside of working hours for decades now.
That's not universal, there's still plenty of places to work where people respect working hours.
To be devils advocate - do you expect your employer send flowers and give vacation days when your parents pass away? Or advance your salary if you short? Or tons of other forms of flexibility in return?
In societies where all of this is encoded in law they seem to be doing worse off than where these things are based on trust.
We introduced "Right to disconnect" laws in Australia years ago:
> Employees have the right to refuse contact outside their working hours unless that refusal is unreasonable. This means an employee can refuse to monitor, read or respond to contact from an employer or a third party.
We don't have "at-will employment", so you can't be fired for arbitrary reasons. And if you were to treat someone poorly or fire them for refusing to be available for free after hours, you would end up in serious trouble in front of the Fair Work Commission.
This is the main value of governments, have them regulate these things for your protection!