trivial definitions is about all we have on a message board full of words.
I don't think anyone is saying that parenting is easy, a walk in the park, or unrewarding.
What I think is being said is that a job is 9-5, you punch in, you do your duties, then you punch out and go home and try not to think about the job until tomorrow when you get up and do it all again. Jobs can be fun, but most of the time they are there just to earn money.
Parenting is much more than just a job.