I'm sure it's not as straightforward as that, and I'm sure you know that too. Neither of us know enough about all the factors involved to pretend to be able to properly analyse something as crude as per pupil spending.
What I see is the front line experience of both a new teacher and someone in it for many many years.
One I see working 65+ hour weeks just to feel like they are barely doing a decent job. Her school are REALLY well off compared to most, and they've just had a budget cut for next year and are having to lay off teaching assistants. Schools in poorer situations already are just not going to cope. Schools are having to send home letters asking parents to donate basic supplies like books and stationary; a huge percentage of teachers are having to buy similar stuff out of their own money just to keep their classes afloat.
My auntie I hear saying this is the worst it's ever been in her career by far, that she's considering jacking it in for the first time. My uncle who was a teacher for 35 years also has already left.
You like to make flippant comments and pretend everyone is just whining, but my experience is that that couldn't be further from the truth; these people love teaching and want it to work but it's becoming unsustainable to fill in the gaps with their good will. They just want to be able to do a good job for their kids.
It's the same in the NHS. You talk to consultants in their 50s and 60s and they unanimously say the service is in the worst place it's ever been; they are ashamed of what we are able to provide our patients compared to the past. The acute departments at the hospital I work at are hanging by a thread.
It's just sad.