Aren't a majority of the TERFs specifically 2nd wave Feminists who who do not like the idea of 'passing' as a female being reinforced. This as because they spent their lives fighting so that women did not have to abide by social norms enforced on them. From their POV, since gender is social, a trans-gender person reinforcing the need for transition to enjoy social aspects of being a woman is actively hostile to their goal of making social norms around gender be deemphasized.

The criticisms of transgenderism by TERFs have being a Feminist (in this case 2nd wave) at its very core. Removing it loses a lot of nuance of their specific criticisms.