Definitely a feminist issue - particularly as it's a stick that is used to beat women with and to make us constantly feel like we're not good enough, whichever feeding method we choose.
The absolute lack of support for women in this area is terrible. Lots of posters but no health visitors or midwives with more than a couple of hours training. In the major city where I lived after giving birth, women would travel miles to attend the only good breastfeeding support group, run by two amazing women.
For the majority of women, breastfeeding would make life a lot easier, and can be compatible with working full time if that's what the mother wants or, in my case, needs to do.
So yes, definitely a feminist issue, but how we manage to get a discussion going without people feeling the need to defend their choice, or attacked for the choice they made, I don't know.
Like all choices made by women, the choice is never made in a vacuum. Perhaps we could talk about the influences rather than the actual act of feeding?