On narrow screens the Vector skin hides tabs under "More". The hiding has a certain order - some tabs will be hidden before others.
It appears that (visual) "Edit" will be hidden before "Read".
It makes more sense to me to encourage people to edit in general and edit in VE in particular by giving precedence to the "Edit" tab over "Read". "Read" is accessible anyway through the article name and hiding "Edit" under "More" makes it harder to find.
(This is based on a complaint of a Hebrew Wikipedia user who in general does like VE.)
See a screenshot: