I teach Reception. I just wanted to reassure you that being assessed as emerging in the PSED strands is not at all unusual (especially for summer born boys). It's definitely not a judgement of their personality, or a sign that they're being written off. Just like the other areas of learning, it's simply saying these are the Early Learning Goals and, as of yet, your child hasn't met them. That's not saying they never will. You've been told he's nearly there. That's great. If you think about it, if he was Autumn born he likely would have been there by now, as he'd be 6 months+ further on in his PSED development. The academic subjects can be less age dependent, as the class start learning phonics and number together, regardless of their age in September when they started. Maturity can sometimes affect focus, and learning behaviours, but they are introduced to the content of the maths and literacy curriculum at the same stage of the year, regardless of what month they were born. For PSED, Physical Development and Communication and Language (the 'prime areas' within the EYFS curriculum), summer borns are at a disadvantage as their older peers are naturally further along on their journey when they start school. It's always been a huge bugbear of mine that they're all expected to be at the same place in these areas at the end of Reception, despite some children being nearly a whole year older than their summer born peers. That can make a huge difference to their skills in the prime areas.
Here are the Early Learning Goals for Self-regulation and Building Relationships:
Self-regulation
Show an understanding of their own feelings and those of others, and begin to regulate
their behaviour accordingly.
• Set and work towards simple goals, being able to wait for what they want and control
their immediate impulses when appropriate.
• Give focused attention to what the teacher says, responding appropriately even when
engaged in activity, and show an ability to follow instructions involving several ideas
or actions.
Building Relationships
• Work and play cooperatively and take turns with others.
• Form positive attachments to adults and friendships with peers.
• Show sensitivity to their own and to others’ needs.
Most of that comes down to age and maturity, SEN aside. Some summer born children will achieve it by the end of Reception, but for others they are simply not quite there yet and that's ok. You wouldn't expect all just turned 5 year olds (or those who are not even quite 5 yet) to be there. I probably wouldn't have been at the end of my Reception year if the Early Learning Goals were a thing back then and I'm a spring born girl! I was very impulsive at 4/5 and struggled to regulate when things didn't go my way. I grew up and matured, and have gone on to become a teacher, so all is not lost!
Please don't see it as a judgement on your son as a person. He's certainly not being written off. It's a good thing the school are acknowledging he's not quite there in those skills yet, so his next teacher knows he may need some support still in those areas. The Early Learning Goals are based purely on teacher judgement. Sadly, some teachers tweak their data (encouraged by headteachers) to help it look better if a child is considered to be nearly there. The fact your son's school haven't is a good thing, as it shows they value accurate judgements in order to do what's best for the children, over having outstanding data.
The Early Learning Goals are a unique assessment. Your son will never be formally assessed in PSED again so honestly I wouldn't worry about it. He is following his path and will naturally develop those skills when he is ready.