Effective altruism is based on the core belief that all people count equally. We unequivocally condemn Nick Bostrom’s recklessly flawed and reprehensible words. We reject this unacceptable racist language, and the callous discussion of ideas that can and have harmed Black people. It is fundamentally inconsistent with our mission of building an inclusive and welcoming community.
— The Centre for Effective Altruism
It's fine.
Studies don't just use identical twins but twins in general. You are equating my two claims and attacking claims that I haven't even made, I never talked about "whether or not some disease has a genetic component to it, when a twin study shows that there is?". I made a claim that twins, even identical twins, don't share exactly the same DNA and provided a link to an article that gave more information, and I made a second claim that twin studies were flawed and provided that claim with a link to an article with more information about that. All this stuff about that it can't help us find diseases or that twin studies "shouldn’t be used" are claims I never made.
EDIT:
For the record my study has some biostatistics, but it isn't my strongest field and I'm mostly leaning on stuff my professors have explained:
I will also probably defer to a biologist/biostatistician.