That sounds like bad management. There are companies where you can work your 40 hours, unplug when you go home, and still get a good salary.

Companies with poor working conditions usually suffer from poor management, which causes burnout and high turnover. The problem is that poor management is so common that many people think burnout and high turnover are normal.

My company has people hired (production assurance) especially for this. Being on call is part of their job description. I suspect it's a common arrangement.

Anyone who is skilled enough to do that could get a better job that pays more and doesn't require to work on call.

Employees tend to leave the job or the workforce altogether. The ones who did not yet are in short supply.