I know the argument you'rre making popebishop, have been on the feminist boards for years and a feminist for longer. But I don't entirely agree.
Gender as it's generally understood is not just personality/any personal attribute. It can mean sex, or it can mean cultural behaviours thatare linked to or associated with sex. I am entirely opposed to restrictive and damaging gender stereotypes, and I'm opposed to gender ideology that implies that a gender stereotype you want to enact determines your sex. That's nonsense.
But, having thought about it a lot I do think gender plays a role in society and not necessarily an unhealthy one. It should be no surprise in such a cultural species that cultural norms and behaviours are attached to the sexes, and to some degree grow out of or are based on them. (For example in clothing, "feminine" clothing tends to emphasise or exaggerate the female body, and the same for masculine clothing.)
We can use gender to indicate or hide our sex and how we relate to gender roles - do we embrace them, play with them, reject them or feel free to pick and choose from everything? In the 80s days of gender-bending, gender wasn't rejected outright or abolished - it was subverted, challenged and distorted but it was still being used to say somethig about how we feel about being the sex we are.
In my own life I reserve the right to dress in a feminine way if I want - because I'm feeling like I want to look female - or in a masculine or neutral way but when i do that I am making use of gender norms. The alternative is to have npthing gendered at all - I don't think that's realistic because humans will always associate some cultural things to some material relaities. And also I genuinely don't think most peple would like it.
When it's damaging is when it restricts. A situation where it's not OK to break out of or just ignore a gender stereotype - no. A situation where the gender roles, norms or stereotypes restrict or harm women (or indeed men, as they do) - no. But that doesn't mean gender as cultural expression has to be bad in itself. Just as we have cultural expressions linked to other aspects of being human (age, ethnicity, local area etc).