The differences between teaching now and 35 years ago, when I started, make it almost a different profession.
In Primary at least, schools mostly staffed by experienced teachers - and the job was very secure. No performance management at all. Every teacher was in a union and just refused to go along with anything they thought was unreasonable. Staff meeting half an hour once a week mostly just running through dates in the diary.
Every class had a classroom assistant (as they were then called), to assist with any task needed from photocopying to washing paint pots (not a teaching role except for supporting art & craft or maths games - it was frowned upon to do so as unqualified).
Break times were 20 minutes twice a day, lunchtime 1.5 hours - we actually had time to sit and chat!
There was no set curriculum as such - just text books or workbooks even for Reception. The only requirement was you had to teach one RE lesson a week - the rest was entirely up the teacher, as long as the work books were completed at the pace suitable for each group. There were no records kept - other than a once yearly reading test purely for the schools planning and assessment for the following year; and results not shared with parents or LEA. You wanted to know how a child was progressing - you looked at their exercise books which were kept for a year then sent home with the child.
It was inconceivable that a child would be admitted who wasn't toilet trained, or was violent towards staff. Parents knew that if there children were disruptive a strong HT particularly one with a good reputation, would tell them to take their children elsewhere - no formal exclusion as parents were keen to avoid the stigma and would then be unlikely to find another MS school.
No parent could just come in to speak to the teacher - the role of the HT was to deflect them, take any flack and support their teacher. No tech of course. Only the secretary talked on the phone to parents, and usually only in an emergency.
Special needs were supported by lots of LEA external professionals - speech therapist, reading support teachers, and various others coming in twice weekly to take out individuals or small groups, school nurses for any pastoral, health concerns.
No real safeguarding or pastoral - it wasn't really seen as the schools role - they were their to teach and not much else.