Nowadays, in progressive enclaves of Western countries, transness is definitely known to be a thing—and in particular subcultures that form around [non-sex-balanced interests](http://slatestarcodex.com/2017/08/07/contra-grant-on-exaggerated-differences/), the numbers can be quite dramatic. For example, on the [2018 _Slate Star Codex_ reader survey](http://slatestarcodex.com/2018/01/03/ssc-survey-results-2018/), 9.4% of respondents selected _F (cisgender)_ for the gender question, compared to 1.4% of respondents selecting _F (transgender m → f)_. So, if trans women are women, _13.4%_ (!!) of women who read _Slate Star Codex_ are trans.
I can't say this causes any problems, because that would depend on how you choose to draw the category boundaries around what constitutes a "problem." But objectively, injecting a substantial fraction of otherwise-mostly-ordinary-but-for-their-gender-dysphoria natal males into spaces and roles that developed around the distribution of psychologies of natal females _is_ going to have consequences—consequences that some of the incumbent women might not be happy about.
Nowadays, in progressive enclaves of Western countries, transness is definitely known to be a thing—and in particular subcultures that form around [non-sex-balanced interests](http://slatestarcodex.com/2017/08/07/contra-grant-on-exaggerated-differences/), the numbers can be quite dramatic. For example, on the [2018 _Slate Star Codex_ reader survey](http://slatestarcodex.com/2018/01/03/ssc-survey-results-2018/), 9.4% of respondents selected _F (cisgender)_ for the gender question, compared to 1.4% of respondents selecting _F (transgender m → f)_. So, if trans women are women, _13.4%_ (!!) of women who read _Slate Star Codex_ are trans.
I can't say this causes any problems, because that would depend on how you choose to draw the category boundaries around what constitutes a "problem." But objectively, injecting a substantial fraction of otherwise-mostly-ordinary-but-for-their-gender-dysphoria natal males into spaces and roles that developed around the distribution of psychologies of natal females _is_ going to have consequences—consequences that some of the incumbent women might not be happy about.