I'd argue that our current understanding of transgender/transsexual identities has not really progressed much since Harry Benjamin wrote about it in the 60s. At least back then sexologists realized that homosexual trans and heterosexual trans represented two distinct groups - with homosexual trans people usually experiencing gender dysphoria in early adolescence and heterosexual trans people usually later in adulthood. There were even further subclassifications of trans identities in the literature (primary transsexualism, secondary transsexualism, transvestism, etc). All of this has been greatly simplified by the current narrative which is that gender dysphoria arises as a result of a mismatch between gender identity and birth sex; self-id is to be taken as truth; and the treatment is social transition and puberty blockers followed by hormone therapy.

Recalling the homophobic and eugenics-motivated origins of SRS does not simplify this narrative. It does the opposite. The current discussion surrounding gender transition (especially in children) makes no connection to the historic abuse of LGB at the hands of psychiatrists during the homophobic WW2 and Cold-War eras, in which gays and lesbians were subjected to surgical castration, chemical castration, lobotomies, sterilization, electroshock therapy, and other conversion therapies. But there is a connection.

Why should we be concerned?

"Gender dysphoria in children is more heavily linked to adult homosexuality than to an adult transgender identity, especially with regard to boys" ( from wikipedia article on Gender Dysphoria in Children)

By treating gender dysphoric children with puberty blockers, we start them on a path to hormone therapy and surgeries resulting in the state-sanctioned, sexologist-approved sterilization and castration of gay people. Sound familiar?