Sigh. OP is either a troll or extremely hard of thinking so probably wasting my time, but here goes...
I am not a teacher, I am a non-teaching DSL in a school so I work alongside teachers and know a lot about the day to day reality of their job.
OP's '9-4' claim is pure bollocks. I get into school at 7.15am the staff car park is already half full. Whenever I have to stay late for an event or meeting there are always Teachers in their classrooms working well into the evening. Those who can't stay late due to their childcare commitments work at home, I know this because I often get emails from Teachers at 10pm or later, and on Saturdays and Sundays.
The argument that "teachers got paid through covid when schools were closed" is idiotic on many levels. We were NEVER closed. We had over 200 kids in everyday, more when the government expanded the definition of vulnerable. When teachers weren't supervising the kids in school they were planning and delivering online lessons, making phonecalls to the vulnerable kids in their tutor groups, delivering food parcels and all manner of other things to support vulnerable families that were not in their job descriptions. Then when school staff were asked (told) to don full PPE and covid test hundreds of kids a day in the school gym, in addition to our other work Teachers were there alongside me doing this for no extra pay. We came in during the holidays to do the testing so it wouldn't cause further disruption to learning. They got paid because they were WORKING! The fact that some people genuinely believe this was a perk is fucking ridiculous.
Behaviour has gotten worse, a lot worse. The social issues we are facing have gotten more complex but we cannot get support from Children's services or CAMHS as they are so overstretched. The level of SEN need has risen year on year because we are expected to accommodate kids who, a few years ago would have been in special schools but now there are no special school places. We cannot meet this need because we do not have enough staff, or enough resources. This means more assaults, more serious incidents of self-harm, more challenging behaviour that disrupts the learning of others. None of this is the kids fault, but it's not the teachers fault either and I don't blame those who are deciding they've had enough and walking away.
Staff who have been buying equipment and resources out of their own pockets for years are not able to sustain this due to the COL crisis. I am having to issue food bank vouchers to staff now, as well as parents. Staff are leaving for the private sector because they cannot afford to stay and we cannot afford to pay them more. School buildings are crumbling, we can't even afford to put the fucking heating on. Staff need to be paid a living wage, but the government expects their pay rise that OP keeps bollocking on about to come out of the schools budget. The same budgets they have cut year on year for the last 12 years. This is wrong. Plain and simple.
The recruitment and retention crisis in teaching is no joke. We have teachers being pressured to teach subjects at GCSE and A level that they have little knowledge or confidence in, which makes them more likely to leave. We have GCSE and A Level classes with no teacher at all, just permanent cover. Now we are struggling to get cover teachers because many of them have also decided 'fuck this for a game of soldiers' and gone off to do private tutoring or something completely unrelated. We cannot recruit decent, experienced TA's when at one time competition for these roles was fierce. Where we used to have our pick of candidates who were over qualified if anything, now we have support staff working in schools who we know are not up to the job.
If you are so short sighted or entrenched in your anti-union views that you cannot see how all of the above is so much more disruptive to your DC's education than a few days of strike action, I don't think there's any reasoning with you.