I see what you're saying, I think it's just a difference of approach/opinion. If the question had been 'should I take my pfb newborn to be weighed every week?', I'd also have said, 'no, don't bother, you can look and see he/she is thriving'
DC3 has just gone into reception and for several of the parents it's their first child going through the school system. They want to know what everyone else's child is doing, why their child can't do x,y,z, how is the teacher is challenging them, why don't they have a reading book yet, when will they get homework, why is my child crying when I get him to 20 mins of flashcards every night' etc etc.
I'm forever saying 'relax, it doesn't matter, he/she's 4 and been at school for a month, if they're happy and settled that's really all you need to worry about at this point'. Whereas you may say 'well, if you look here you can find the curriculum for 4 year olds...'
'There's no reason we shouldn't take an interest in what a 2 year old might need to be learning'
I think this is the difference. I don't think there is a list of things a 2-year old 'needs' to learn. It is my view, that if you put a 2-year old in an enriching and stimulating environment they will take from it what they need, when they need it. This will be (and should be) different for each child.
I'm also a big fan of unstructured home schooling through the early years, I just favour a more relaxed (if that's the right word?) approach to things. I fully appreciate this isn't for everyone, but I do think that my view/opinion/advice is equally valid to your view/opinion/advice.