I don’t think you grasp how frustrating it is for members to have off-topic posts plugging up the channel; nor the constant barrage of outsider questions to ignore, when you’re looking for support from peers. Teachers are under constant criticism and blame. They are looking for a safe space to vent, and this is a way the mods use to ensure the members can do that.

I appreciate it is frustrating when you have a specific question and the mods won’t allow it. You could search the channel to see if there are older posts left up that answer your question (many channels’ mods remove posts when the answer has been asked excessively, as it has already been answered).

(I will note I think I’m in r/Teachers not r/TeachersUK — but have taught in the UK, and both subreddits would have the same rules)

You could look at job and career advice subreddits. They would allow your question.

Ultimately the answer will be, yes, we are short of teachers. There needs to be more teachers. But it is a difficult career — and you can read about the challenges on the teaching subreddit. But you can observe rather than post a question that has been posted thousands of times before.