Every table has an extra full width border when viewed on a mobile resolution:
This styling is for over-wide tables, but those look fine without the extra border:
The styling looks fine when viewed at a tablet/desktop resolution.
borders currently exist on table cells and tables.
On mobile we enable horizontal scrolling by enabling tables as display block and overflow auto
This however conflicts with display table's ability to collapse borders
The border should not be removed as it breaks displays of tables such as https://en.m.wikipedia.org/wiki/Help:Sorting#Numerical_sorting_problems
We need to find a way to collapse borders on tables where two borders become aligned.
I think the table code is a little messy. When I view https://m.mediawiki.org/wiki/Help:Tables for instance in minerva, I'm seeing many tables without borders.
It seems like on the short term, yes, we can remove the border. Seems like it was added in T105596 by @kaldari (61eb842 MobileFrontend).