I see a difference in kids I know.
The kids who have parents who chat to them from birth, whose parents are engaged and interested, whose parents don't deploy screens as a default way to entertain their kids, and whose parents don't spend all their free time on a screen generally seem to be more able and school ready than many of their peers. The kids who are allowed to fail (obviously in an age appropriate way!) seem to fare even better. This has nothing to do with income or education or class btw.
Obviously this is all anecdotal. A public enquiry feels like a step too far, but for sure we need to look at how society treats children and families.
My view is, as a society, we massively underestimate what children are capable of. That's not new - it's always happened - but when that's coupled with smaller families, the "professionalisation" of parenting (e.g. mummy bloggers, parenting 'experts', the idea you only have kids when you're totally ready etc.) and parental guilt about not being present enough it's a bit of a shitshow.
Parents feel that when they ARE around their kids, they need to be on their A game. So rather than the 70s/80s (and earlier) somewhat laissez-faire parenting of "they'll be fine, I've got some roses to manure, go and play in the shed" you have too many parents who constantly hover, feel they have to buy the latest gadgets, and who structure time to the Nth degree to ensure Junior is getting the utmost exposure to X.
The net result is kids who've never really been given the space to just be kids.
This isn't a criticism of parents btw - most people are trying their very best. It's a criticism of society. Shit pay and shit housing mean that parents who'd love to spend more time with their kids simply can't afford to while we simultaneously denigrate and underpay those who work in early years. It's a very sad state of affairs.
All that being said, most kids I know are great. And while there are real problems with not enough kids being school ready and with discipline, and the effect social media has on kids I maintain that the vast majority of children are doing well. I work with a lot of Gen Z and the way in which they advocate for themselves and their needs is impressive; I wish us Gen X and Millennials had been like that!