I noticed in my DS's school that he was just not being supported (ASD high functioning) because there were 10 in his class with severe SEN and I was known as a teacher and Governor, so was left to pick up the pieces because staff knew DS was supported at home. Meanwhile he couldn't access the curriculum because of the distress and challenges of so many other poor kids in his class.
This was my experience for years, teaching in an inner city school with high deprivation index and a large % of non English speaking children. As in, no words at all. Some were very able but we had no resources (extra adults) to help them. We also had so many SEN children all with different needs, very diverse emotional trauma in some children, kids with parents in prison, quite a few travelling families, various cases of addiction and violence. The children were lovely individuals and I desperately wanted the time and resources to help them all. But classrooms were regularly evacuated due to screaming kids throwing chairs, the ability of classes to listen to very simple instructions was poor and there were so many gaps in previous learning. It was extremely difficult.
However since teaching in a naice leafy area I have noticed some issues are pretty much universal. Gaming has had a huge impact on behaviour. Tiredness due to late nights and unregulated bedtimes, consoles in bedrooms and the derogatory way gaming children speak to each other. Many children don't know how to have a pleasant conversation about anything--football, films, etc and I think there is a link to the gaming headset culture.
Lack of life experiences is another area where there was crossover between the two settings. You might expect this in the deprived area--many children had never left their city, never been to a beach or farm, walked barefoot on grass, etc. So their imagination and writing ability was affected. But some children of busy middle class parents are fobbed off with devices much of the time, don't ever eat dinner with their parents etc.
I think it's a ticking time bomb which has already started to explode. Poor social skills due to babies and young children not being talked to enough, manners not being taught, the high stress lifestyles causing digitally distracted parents. Behaviour is going to get worse.