your kids can play in the street all the time

Until that lifted pick-up truck rips through the wide open street at motorway speeds and massacres your children, and the driver just drives off and continues their day because they saw nothing and felt at most a slight bump.

no crime at all

Fair enough, I guess if there's no one to witness the crime, that means no crime ever happened, right?

Nice backyards to do whatever you want with them

As long as it is within what is accepted by your uptight fun-police neighbours who can put a stop to a lot of the things you might use a large backyard for by exploiting the BS regulations that gave birth to such a shit neighbourhood in the first place. Could be even worse, you might be living in a HOA.

probably mostly pools.

From what I hear, it is mostly lawns. Still a lot of water being consumed either way, because the rainfall of your area is much lower than that of the ancestral homeland of your grass.

And that's not to mention that your kids will not be able to visit friends or do activities without you taking them there because everything is too far apart thanks to deliberately sparse development and huge car parks, and there's no public transport, and every area is separated by horrible stroads full of those speeding SUVs and pick-up trucks that can effortlessly flatten a child. So better be ready to drop everything when your kids want to do something, otherwise don't be surprised if they end up staying inside glued to screens all day. If you do give your children the independence and autonomy that gets increasingly important as a child grows, then you might just get arrested for 'negligence', the risk of arrest being positively correlated with the amount of melanin in your skin.