The risk of developmental issues was obvious to many people at the beginning of the lockdowns. Now we have some data. It will help us make better decisions in the future.
Every choice has consequences.
I "love" how you and the comment below can take a "be gentle with each other" comment and turn it into a springboard for your anti-lockdown rhetoric.
Enjoy the rest of your weekend.
You don't even need a study for this, it's just common sense for people who have interacted with a toddler in their life before and after nursery (after 2-3 years old, I wouldn't recommend sending them before - they tend to not be ready for social life and not having one dedicated adult to them)
Lots of common sense things turn out to be false, and the plural of anecdote is not data. We absolutely need studies.