I can never see the point of comments like these. Not one person who reads that will have his mind changed.
HTML/CSS can be nice to have in such a situation, although a refusal to learn other GUI frameworks probably makes for a poor (native) developer.
No it doesn't. Either the developer benefits or doesn't benefit from "refusing". There's only so much time in the day. I'll refuse to to learn Qt or gtk+, unless there is some overwhelming benefit for me to learn it.