I've been a teacher, and I'd like to think I've been a supportive parent to my DCs' schools working with them to enhance my DCs' learning. I was even a regular volunteer in the classroom and supporting PTA events.
I hit frustrations with them, particularly through the junior school years when Covid hit and parents were frozen out of school life for 2 years. A couple of months before this DS1 had been diagnosed with autism on top of existing diagnoses of dyslexia and dyspraxia. It became very difficult to hold dialogue with the school. By the time we could finally have in-person meetings he was half-way through y6 and his needs were clearly not being met- even by the simplest, cheapest things like letting him write in pen rather than waiting for a non-existant cure for his ill-formed handwriting. It was very much a case that he's bright, masks, doesn't make a fuss and therefore was solidly ignored. When I tried to raise access arrangements for SATs, I was shut down with "he's doing well enough". He did not get extra time to balance his slow writing and processing speed and he did not meet his targets. When the result was released in his report the day before he left, "anxiety" was blamed. 1) school had never raised concerns about anxiety in class - infact they were quite happy to gaslight that he was happy despite evidence to the contrary (body language on dojo clips from in lesson) 2) anxiety with ASD is a legitimate reason to have access arrangements even without his literacy and processing difficulties. Reports were issued at the last moment so there was no opportunity for constructive dialogue about their content.
The whole school- parent relationship has changed compared to previous generations. There is more expectation on parents to support reading, homework, awareness of this, wear themed non-uniform for that. There isn't the clear distinction of school-home life that there was in my childhood and before. Some of it is positive in encouraging parental involvement, but it does put pressure on teachers by increasing the value and expectations of stakeholders. Not all parents are polite and have reasonable expectations.
Modern parenting culture can result in quite isolationist outcomes. Values that appear positive when raising one or two children don't transfer well into settings of 30 children of differing needs. This can trigger clashes between expectations of parents and teachers.
It is a hard balance to strike. Engaged, supportive parents are an asset to the school, but communicating with parents is a significant addition to teaching workload and emotional load.
Teaching at secondary in the 2000s, I wasn't expected to have much additional communication with parents. That began changing in the 2010s with phone calls to follow up on behaviour incidents. By my final year, with tired y8s and y9s that ended up adding an extra hour to my leaving time on Friday afternoons, displacing that hour's work to home that I already had to do. Some parents were actively supportive. Most ambivilent. It didn't result in a substantial difference in classroom behaviour.
I ended up leaving because teaching took more time and energy than I could reasonably spare while having my own young children. The growing extra meetings and admin/data ended up pushing out the planning and marking to late nights and very early mornings while my children slept and it was not a healthy, sustainable lifestyle.