Well the reason I don't care either way is because (a) WP:TITLETM has nothing to say on the !, since it is a matter of editor choice and sources, and (b) this is a trivial MOS issue compared to WP:CRITERIA. Which is why I've done exactly what you've asked and changed the proposal to Want (Berryz Kobo song) as you requested. ::::As for taking up time, I agree it would be better to amend guidelines somewhere to make it clear that ! is not sufficient for WP:CRITERIA/WP:DAB. But there are in fact a limited number of articles, disproportionately of Japanese songs and albums where ! performs a visual function ウォント!. And it's no great trouble to do them one by one since different editors have contributed to different articles.    