Apple isn't perfect, but they have a good track record of providing updates/security patches and in general supporting the hardware they put into the world. On the other hand Android updates have been a mess forever, and Google have a reputation of pulling the rug from under customers that adopt their products.
I have more faith in Apple delivering six years of updates for my iPhone without a formal commitment, than I do in Google delivering seven years even with this statement. I wonder how many other people feel the same.