Lucky girl, you are spot on! I have seen this too. My G'dtr No1 is 8, in yr 4, and gets at least 5 hours of homework each week, plus reading and spellings. G'dtr No2 is 5, in yr1, and gets reading, spelling, plus about 2 hours of other work each week. I think the load is heavy, but DiL makes sure the work gets done. The problem, I think, is that there is not enough time in school day these days. When I was at school we finished at 4pm. My gdtrs finish at 3pm. Those 5 extra hours each week would make so much difference.
Because there is so much pressure on teachers, children do not get enough of their time. G'dtr No 2 has a speech delay which means she has trouble pronouncing some letter combinations. She is much improved now, but in reception she was marked down as behind in her reading. She is actually a good reader, has moved through the set stages ahead of most of the class, but because no one could be bothered to actually take time to listen properly during guided reading, and understand that the issue was with her pronunciation, not her reading skills, she has unfairly been identified as a low achiever. If there was less pressure and more time this sort of thing would not happen. And in what sort of world do we decide that a four year old is 'failing'?