Could we set "'no ui' => FALSE" for uid argument plugin?

I have created a panel page , set the path to "user/%user/profile", and assign a context "user:ID" for it as argument.
But the type of this argument is "entity_id", I want to provide a visible menu entry for this page.
Then i change the code of uid.inc (at ctools\plugins\arguments), Set

'no ui' => FALSE

insead of

'no ui' => TRUE.

Then i could choose uid as argument type, and could set normal menu entry for the path.

My question is why set 'no ui' => TRUE for uid and nid argument type?