"Why do some people find daycare a negative?"
Now I'm not speaking for anyone else, and I'm not judging anyone, but for me - I'm a DIY kind of person. I make my own family meals, knit my own socks, write my own books, do my home renos, etc... I enjoy puttering around in my life, and giving up the car wasn't a big sacrifice to be able to do that.
In theory, I'm not opposed to daycare. Our neighbour's kids went to a daycare across the street, and when my daughter was 3, she asked if she could go, too. So I signed her up for a couple days a week.
It didn't work out. My daughter was... odd, I guess. Irritating to some people. Somewhat hyperactive, a chatterbox, and also VERY picky about her food. And the daycare wouldn't let me pack meals for her that she'd eat, so she'd go all day without eating. And no, the whole "if she get hungry enough she'll eat anything" didn't work with her. Did I mention she was also stubborn?
So we discussed it, and she told me she didn't want to go anymore, and I said, "That's fine!" That was WAY too much money to throw away on something we didn't need, and she didn't enjoy.
My son started junior kindy when he was 3 (late birthday), but burned out on it by the next year. He had a learning disability which hadn't been diagnosed yet. One Christmas, he told me that he wished he was dead. I talked to his kindergarten teacher, and she suggested homeschooling, and so that's what we did for the next several years. My son went back to school when HE was ready, and not before.
Now my children are both teenagers, and both in public school, and I can't count the number of times teachers have told me, "You've got two really great kids!" I think I did well by them.
If I had another child (fat chance!) I wouldn't even consider putting them in school before age 5. Of course, death, divorce, financial ruin, etc... would change my position. Necessity rules.