Mostly because it was boring and isolating. To be clear I didn’t dislike the yard! I disliked what living in an area of traditional SFHs (aka the suburbs) entailed.
My cousins growing up lived near the core of a small city and visiting them was like a breath of fresh air. So many fun activities nearby, things you could walk to, way more people to meet.
Where I grew up I was basically stuck on just my street unless I could convince my parents to drive me somewhere, and even when I had that there was nowhere interesting to go.
I guess when I was like <10 years old it didn’t really matter, but the older I got the worse it was. I’d never move back to a suburb personally, and I certainly wouldn’t raise kids there.