koma-
Cheftza shel mitzva and the like doesn’t mean anything. It’s a purely legalistic term and does not at all imply that a woman is an object. FYI there are places where a man is also called a ‘cheftza’ (object) such as in discussions in the meforshim regarding making a future-tense neder. If you know what I’m talking about fine, if not then learn Nedarim, my point is you can’t bring a proof from a purely legalistic term regarding the hashkafa of the matter. This has already been demonstrated above with regard to the word kinyan.