Agree with devora.
I feel annoyed on several levels.
One is the idea that a man who looks after children should imagine what he is doing is so inconsistent with his gender, that he sees it as being a 'mother'. I know plenty of brilliant, loving male parents and it's insulting to imply that there is something lacking, or different, in their capacity to parent.
I also feel angry for the reasons outs and orlando give, that this ignores the biological and social context in which many (not all, as they acknowledge) women are mothers - which includes physical issues like breastfeeding and social ones like discrimination.
And I don't think an egg is a blank canvas. Not because of genetics (surely any newborn is a fairly blank canvas?), but because it ignores how difficult and dangerous it is for women to donate eggs.