Language is organic, yes.
But the forcible redefinition of words to include things they are not supposed to include (because they are the literal opposite) is not the organic evolution of language, it is the forcible colonisation of language.
Now I'm happy to put my hands up and admit that I have no skin in this particular definitions game because I'm straight. But when I hear lesbians saying that they want to define their sexuality by reference to biological sex, not gender, and that including male people within that definition means they no longer have a word for what they are, that resonates with me. Because I feel the same about the word woman. And of course, lesbians are being erased on two fronts, because they are both women and lesbians.
I feel very strongly that a woman is a biologically female person. I think the word includes all adult female humans (even the ones who say they do not identify as women) and excludes all adult males (even the ones who say they do identify as women). I understand that trans women want to be women, but they can't be. The only way they can be women is if we strip the word of all meaning. And then we have a word that means "adult female humans except the ones who identify as men or non binary, plus adult male humans who identify as women". I do not understand the point of this category. The people in it have nothing in common with each other (that they do not also have in common with all other humans), and there is nothing in society that needs to be organised according to this completely artificial grouping. At the same time, we no longer have a word that means "all adult female humans, regardless of any identity they may or may not have", which is something we do actually need a word for. We know we need a word for it because in contexts where it cannot be denied that sex matters, we are being renamed "people with cervixes" or "menstruators" or "bodies with vaginas", which many of us find pretty offensive.
I think that if trans women had any respect for women, they wouldn't call themselves women. They would respect the fact that we are not the same and that we do actually have the right to define ourselves in a way that doesn't include them, even if that makes them unhappy. But they don't respect that. And it doesn't stop at "woman". Now they are saying they are female too, which shows that whatever word we use to describe ourselves, they will not let us have it for ourselves but will start claiming to identify as it.
I imagine that this is how gender critical lesbians feel about the word lesbian.
It really didn't have to be this way. And this is ultimately bad for inclusion and acceptance of trans people, because people who feel bullied and threatened and colonised will naturally not be inclined to be welcoming and inclusive towards the people they feel are bullying and threatening and colonising them.
If we could acknowledge and celebrate our differences and respect each other's particular needs and concerns, we could agree that the world is big enough for all of us and work together to find solutions to ensure that everyone's rights, safety and dignity are respected.
But as long as women are being cancelled, threatened, fired, disciplined at work and denied banking services for not agreeing that trans women are exactly the same as them and welcome in all their spaces, and as long as lesbians are being accused of bigotry for saying that their sexuality does not include anyone who has ever had a penis, I can't see that happening.