Not necessarily true for everyone, either of them. Both parts feel too dogmatic, it always depends.

True for me. I used to love writing software. About fifteen years into my career I lost interest in side projects, and by the time I retired anything that smacks of coding seems like drudgery.

I occasionally watch a woodworking YouTube channel. The creator tells people if they start woodworking as a job they'll have to find a new hobby.

I don't think it is cut and dry as that. Of the top of my head I can think of "Jorge Luis Borges" who was a voracious reader and much of his career involved reading (literary adviser, librarian etc.). I don't think (can't know for sure) he hated his job.