I'm specualating when I say that if Staff feel a question has been rproperly answered, and they have nothing more to add to the answer, then they might choose to remove the "modlook" tag and not respond in the thread.

BTW, any idea how does this modlook tag works now-a-days on the support forum? Who has the ability to remove it from the thread and why would it be removed, what is the criteria?

Whatever you change in your Settings will apply to posts or pages you create after you've made that change: it won't affect already created posts or pages.

So the only way to have gallery attachment pages with no comment field is to disable commenting in Settings>Discussion before creating gallery posts or pages, (and override it in the Discussion module of the post/page editor for posts/pages in which you do want to allow commenting).

Please fix this inconsistency. The gallery option currently provides the comment option even though the post itself has comments turned off.