I think these anti-homework points are all valid, but it strikes me that you are talking from a position of secure knowledge that your children are doing well.
They can read at or above their age level
They're doing maths at or above their age level
They can write a paragraph or note to a friend/ relative which is spelled correctly, grammatically correct and coherent.
In all sincerity - that just isn't our situation at the school we're at. Sure they can watch a video for 2 hours, they can do all the hand motions to 'Our god is a great big god' - but not a one of them can write a full side of A4 without a serious meltdown, and certainly not on their own.
Thus, I see these assignments as my opportunity to sneak some learning into their 'education'.
I also fear that I enjoy this time with my kids. I like seeing them work something out and being there when that light-bulb goes on. I like watching them get really interested in a topic. I like seeing their pride in completing a poster (for ballet class, not school by the way) or a little assignment (so rarely sent home - just the once the week OFSTED came, which of course was no coincidence I'm sure).
I do extra because I'm very clear 'the professionals' so obviously aren't.
But please do understand posters, I do respect your stance - I just strongly suspect that things are going along as you would expect them to be. I think your position would be different if perhaps your child wasn't able to read yet (and it's early Y2, which was my case for DD1), or your child can't subtract even 1 from 10 and it's Easter Y2, which was my case DD1) or your child has been given the same book for 'at home reading' for 5 weeks (DD2 Y1) and your ready to shread Big Panda, Little Panda.
As I said, I think welcoming homework very much depends on your situation: the quality of the school, your child's needs and your desire to foster learning.
I would argue bestemor that the actual 'child abuse' is having a school that is content for a child to not be able to read/ write or subtract in late Y2 at age 7 after 8 terms in formal education and doesn't see that as a problem. No intervention, repeatedly telling me and my DH they'll learn that next year, and when we started to do our homework about what other Y2 children were doing in the LEA we were told we're too demanding or 'no other parent has complained' (which was subsequently proven false by the way), asking us to just accept our DD1 'isn't just that bright', etc..., etc... is absolutely grossly unprofessional behavior and a total travesty of their statutory obligation to educate the next generation.
But of course if government policy is only to use the state sector to prepare the next generation of 'serving sector' employees or dole recipients then of course they're doing a fabulous job!