Primary children can't use tech as well as secondary children. Even if they have it. They are usually really good at playing the game they like, or googling pictures of things they like, but hopeless at typing their name correctly to log in, or typing anything at all. This limits what tech we can use.
There is also the issue of loads of families (irrespective of financial situation) not having devices for every child. If you've got 4 children under 11, why at any other point in time would you have 4 laptops for them to watch instruction lessons on? You might have one that they can use, but probably an old one of yours. Any work set for them by school is going to require parent support. If you can't do that during the week (I couldn't do it during the week either), then weekends become homeschool day.
I'm guessing by the number of views lesson videos have, that most people are about 5 days 'behind' - I'm leaving work up for 3 weeks (any more than that and the school webpage crashes), and have only heard from a few parents about needing stuff for longer.
I bought the CGP books for my child's year group - one for English and one for maths (and one for handwriting, because it's really bad) - cost me a tenner. She did a page a day, she watched some Bitesize phonics to go with the page she was doing. And that was that. Keeps them ticking over.
What would have been really cool is a list of life skills that I think are home tasks anyway. Telling the time, using and understanding money, understanding things about measurement etc. Learning times tables facts. Then a website dedicated to that. If all primary school kids, of any age, come back to school knowing their times tables facts, knowing how to tell the time etc, then we can catch them up on the other stuff really easily.