Identity politics tend to be seen as irrelevant or burdensome to those whose identities are constructed as ‘default’ within their society; I am assuming from your profile picture and your statement that “we aren’t defined by our physical abilities” that you are white, (cis?) male and abled — and therefore represent the pinnacle of ‘default’ identities in contemporary Euro-colonialist society. For those of us who do not fit within that ‘default’ identities are inescapable, and moreover, provide us with a way of connecting with those who share an understanding of our experiences. To be able to step away from one’s identity is a marker of one’s privilege.
This particular debate has been written about extensively elsewhere, and is at best tangentially related to this article, which is an analysis of disability representation in Orange Is The New Black, so I will refer you to the following perspectives on identity politics, from people (including myself) who have lived experience of marginalisation. I encourage you to do some reading, and to consider how your perspectives on ‘identity politics’ have been shaped by your own experiences of privilege.