It would be quite nice if teachers liked children, given they work with them all day. Kids aren't stupid and can pick up on when the grown-ups around them would rather be anywhere else.
If they like children, the odds are high that they have children, plan to have children, or spend a lot of time with family children.
Do we really want to drive those kinds of people out of education by imposing increased hours that they can't manage with their personal lives? Teachers who like children will go that extra mile to support them and advocate for them.
How many children will have had support from a social worker because a teacher noticed that their behaviour had changed and that they had odd marks on their skin? How many will have had an assessment for neurodiversity because a teacher noticed their behaviour was different to the other children in the class? How many children will have pursued a hobby or career because a teacher believed in them?
Good teachers who want to be there and who advocate for their pupils change lives.
Think of care. That sector takes anyone, and has low pay, so plenty of people go into it for 'just a job' and that's why we have elder abuse by paid carers.
You don't want to attract people to a job who are not suited for it.
Let's keep education something that people who don't hate children might want to do.