Depends on the business. Global businesses: organisations operating through several time zones, make 9-5 redundant and people need to be available outside of those hours and the luxury of a 4 day week.
If I send an email to China or Singapore, regularly I will get responses at 9pm or 10pm their time.
Many people are working more hours, not less. The difference being the work is less arduous and physically taxing than in the past.
Try making a call between west coast USA. India. Europe CET. And east coast USA.
Thailand was nearly impossible for me to find agreeable times from east coast.