Thanks for the explanation and sorry for the english.
I agree with most of what you wrote (but see Gadi's reservations). I think the main thing is that while I take photography (semi-)seriously and try to improve, My attitude towards video clip is more casual - I want to document something (like how my daughter is at age 2) and not necessarily create a work of art (not that my photographic aspirations are that high). For this purpose, having the ability to shoot video clips in my DSLR is a blessing - I'm already carrying more than I'd like.

This is also not necessarily true. I don't know how good camcorders these days are, but a couple of years ago, my Canon S1 would produce better clip than the average camcorder (and in a more convenient format, at the expense of very large files).