I agree with a lot of your post.
I explained myself rather poorly unfortunately. You’re right that classes often have exercises or tests to do in class, and that these can be very valuable. What I was referring to by testing, is testing after an interval. Thus a class might cover five grammar points in sequence, ten minutes on each, with an explanation and some exercises. Then at the end the teacher will do a quick test by asking some questions on all five grammar points. A teacher might even do a quick test on key points from the previous lesson. The aim is to bring the key points back into the students mind, to refresh their knowledge. This delayed testing has been shown to improve performance. No doubt it encourages students to pay attention in the lesson but it also aids retention.
Our schools might use this technique, I cannot comment.
I had to look Zipf’s law up. Of course we learn through exposure, as you say. However spaced repetition systems (SRS) use a different principle. Research has shown that long term memory storage improves markedly if the student is forced to recall a piece of information by regular testing over gradually increasing time intervals. There is something about the effort of having to recall a word just as you start to forget it that is more efficient at moving it into long term memory than simply passively hearing the word. Plus, less frequent words are less likely to be learnt ‘naturally’. Thus an SRS can aid retention of less common words. As I mentioned earlier, I use an SRS with phrases, it’s much more efficient in my experience. Words on their own are often useless, which is why some people find spaced repetition does not work and they go back to passive listening.
However, I have just remembered that I bought some flash cards which cover the English French GCSE requirements i.e. the school exam taken at age 16. So our schools DO use SRS.
And a good teacher will test students regularly by showing them words and phrases, and asking them what they mean, or to translate them into the target language.
I think this is a good point.
You are right that school language teaching often gets a bad rap:
Two years ago I restarted learning French at the young age of 59. Like many here, I watched YouTube videos, read the entire internet and concluded that comprehensible input was the only true religion, and Stephen Krashen the one true God, Of course anyone who praised traditional classroom teaching, which of course revolved around rote learning of grammar, was an evil sinner, to be pitied and ridiculed. After all, CI is a modern method based on science.
Experience and listening to others has changed my mind.
Like many in England, I spent roughly 2 hours a week, 38 weeks a year, for five years studying French at school. That’s about 380 classroom hours. That’s enough study time to reach a decent B1 level, and I think I would have succeeded had I worked hard. I didn’t because I was lazy, and not interested. But I still gained a solid foundation which helped me progress in later years. Of course they could be improved, there is not enough time spent studying and listening to the language, and of course not all teachers are excellent. I think we expect too much from school lessons, the motivation has to come from within.