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There is a massive range of ability, knowhow, ongoing professional development, etc within “teachers”. The US is in itself a good example of this. In some areas, teaching is a white collar profession. In others, it’s blue collar. In my country it’s entirely white collar. In others, it’s entirely blue collar. This has a massive impact on teachers’ ability, willingness, means, etc to stay up to date. it can take decades for new ‘best practices’ to proliferate. This is ignoring the fact that Education is at BEST a social science and carries with it all the grey area, fads, flip-flopping on ‘best practices’, etc. There are schools of thought. Very valid schools of thought. It’s all very complicated.