i feel that it's always worth working on your problem areas. i started opening up this area a little while ago because i have a lot of tension in there. i've fallen in some weird positions while grappling, and i've been pretty thankful that i prepped this motion ahead of time. maybe if you're just squatting, then you can predict for the most part all of the possible positions you will end up in. if you're engaged in other activities, it might be worth the security to open it up.
it's also been my general opinion that every part of my body i've neglected to stretch has come back to bite me in the ass. normally i get hurt and then realize how tight i am at spot x.