I'm going to try to articulate whey I don't think you can hive off discussions about trans ideology from the rest of feminism or suggest that it has no bearing on what we think of as 'women's rights' - as if it is a totally discrete issue.
I'll try and keep it as brief as possible without leaving out what i think are essential points,
As i see it 'feminism' arose as a response to societal conditions and habitual practices which had come to be seen as oppressive to female people. The term 'patriarchy' came to be used to describe a society in which male people held or maintained all the positions of power, influence and wealth, and used their greater physical size and strength to dominate and/or control female people.
It then came to be felt that it was female biology and physicality that was the root of this oppression. The facts of reproduction, pregnancy and childbirth were the factors that kept women subject to men. Taking control of one's own body, sexuality and reproductive capacity was seen to be essential if female people were going to be able to "meet men in the middle" or be active or even compete with men in the public spheres of life and have more power in the home/private sphere.
The bodies of women and girls are at the very heart of every feminist issue ( 'Our Bodies Our Selves')
Combine that with modern zeitgeist of technology and transhumanism - in which the body itself is seen as restrictive and inhibitive to an individual's free expression and freedom to be and do whatever they please. Human kind has always tried to overcome the limitations of nature; conquer and control it - and this desire has been taken up by consumer culture in which everything can be bought or is for sale ( including other people's/women's bodies, wombs, sexual organs)..........leads us to transgenderism which to my mind is the apotheosis of all of this politics of identity, individuality ( being one's 'best' or 'real' self) and consumer culture.
The body is just a 'meat suit' that one can chop and change or disregard entirely. We are not our bodies.Our bodies are what restrict us or cause us suffering and oppression. There are no essential differences between the sexes apart from their bodies and biology - but we can just disregard that - the body is not real and is of no great consequence.
Yet the body ( the female body) and its sexed nature still remains and influences our lives and our behaviours....even if we like to think it doesn't or would prefer it didn't.
As long as we are on Planet Earth in a body we are subject to its nature, its inherent drives and instincts. The best we can do is modify or moderate them.