Plus it’s always in continuous change. Example: currently in the U.K. there’s a hot debate between (some) feminists and trans women [1] but who knows in the future, it would be 100% feminist to accept all self-identifying females as valid females.
Slightly off topic: Feminisim is a bit of a messy subject (imo), I wonder if one can have a clearer picture if it’s expressed in logical terms :o
[1] https://www.theguardian.com/society/2017/nov/26/transgender-...