I said one of the problems. For me, having worked in a variety of schools, the biggest problem faced by teachers currently is behaviour. There seems to have been a complete breakdown since covid and that's on top of the already very stretching workloads.
However, what I do see among colleagues is people who have been doing the job for a really long time. They might have moved schools or taken management roles, but they've essentially done the same job since they left college. That's hard in any industry and usually not good for the staff member or the company.
I did 20 odd years in a completely different industry before starting in schools and I was done. I'd seen so many changes, many of which I didn't like, I was harking back to "the old days" and felt jaded and burnt out.
Obviously teachers leaving is a problem if you can't get new ones in, but maybe a career change is good for everyone? In the whole the very experienced teachers I work with are the ones who don't seem to like the children or their colleagues very much any more, resist change (they might be right, but it doesn't help running the school), begrudge a lot of what they're asked to do and are just waiting for the day they can leave. Not all, but many. A workforce like that is a problem.
It's not their fault, one career for life is what they were led to expect, but maybe it's not a good thing?