Unfortunately some children were going to lose out whatever decision they made.
Some are saying they should open up schools fully again. Others are saying its a ridiculous notion.
Schools are unable to cater to the generally already oversubscribed classes they have whilst maintaining social distancing for the sheer volumes of students. Most schools will be running short staffed due to teachers have families, vulnerable households, shielding or caring responsibility for people within those categories.
If they had picked other year groups to prioritise then the parents of the kids currently chosen would be annoyed. Its a lose lose situation whatever they decide.
I have a Yr 5 child so isn't returning, even if he had the option, I have to use public transport 4 times a day with a baby in tow whilst both myself and partner are in the vulnerable groups. DS already struggled with anxiety and has suspected ADHD so I've never felt the need for a break and some resemblance of normality more, but no it doesn't seem sensible or feasible for schools right now, and I'm all for supporting the school in protecting the staff where possible too.
The social side of it is horrendous on them, I completely agree but now we are allowed groups of up to 6 in a public area, ive arranged to meet with mums and their child (separately not all at once) for kick arounds in the park, so he can finally see some friends. Maybe that's something you could try?