I think OP is getting a hard time here. Mumsnet of course is a weird mix of teacher-bashing and 'you must never grumble about school ever ever ever, don't be so entitled', so this is not surprising.
Yes it's a really tough adjustment from nursery to school, in terms of how much info you get back about your child's day. It becomes normal eventually but it is an adjustment.
Joggers is a luckier uniform option than many poor 4 year olds get, but again it's a shame to have different info from different sources and also policing children's clothes (assuming they're clean and allow for decency and movement etc) is annoying and stupid, if deeply entrenched. Not that many years back we expected school children (boys anyway) to wear shorts year round and not complain. I'm sure having 30 children grumble that they're cold is annoying, but I'm not convinced that mandating long trousers fixes this, and even if they don't grumble about being cold they'll surely find something else.
I'm going to go against the grain and say that my son's teachers in reception and Y1 did find time to scribble something encouraging in his reading diary every week. Really not a private school. They were fab and v experienced teachers, if that's worth mentioning.
Finally - yes it's been a tough 18 months for all age groups. All the teachers I know are mindful of the fact that this cohort and their parents are coming in with some atypical experiences, and adjusting accordingly- whether that's a cohort of 3 year olds, 4 year olds, 11 year olds, whatever. I got that OP wasn't saying it's only four year olds who've missed out, and in any case the urge to rank this crap is so reductive.
OP (if you're still reading) - it will start to feel more normal. You're not unreasonable to be upset though. Some of it is rubbish really.