This is a writing task in my IELTS practice test book
Nowadays, a growing number of people with health problems are trying alternative medicines and treatments instead of visiting their usual doctor. Do you think this is a positive development?
I have asked many native speakers, they explained to me that because generally, each person has 1 doctor, so that the word "doctor" is used in singular form. This means I think that "their" here means "each person".
But I have another opinion, that if "their" means "people in general", then each person has 1 doctor, so that people has their doctors ( people in plural form have doctors in plural from). Can I use the word "doctors" (plural form) in this sentence with the same meaning?
Here is another example:
Nowadays, people spending more time away from their homes because they spend longer in their workplace. Discuss the advantages and disadvantages.
In this example, people use plural form instead. Can I use singular form "home" instead?
For general statement with the subject "people", I don't know when "their" means each person, or their mean people in general.