For the most common use (so... 99% of user? ), members are xF's, and help & search are definitely xF related.Hm, i have to disagree.
IMHO members aren't forum related.
People which are using the xenforo framework for there complete page have not only "forum specific" members.
When somebody registers on my page, he's a member and gets access to the blog, to the gallery, to the shop....
IF xenforo provides sometime a blog/gallery/whatever, there will be never a own memberlist for this content types.
it wouldn't make sense to have
Also the members page have a own tab, and it's not inside the forums tab, and the breadcrums and the navtabs "belongs" together.
(hope you know what i mean)