For what it is worth, hormones do not change the cells coding. When a male takes estrogen their body still signals for production of testosterone. And unless the testes are removed or testosterone production artificially suppressed, that testosterone will be produced.
estrogen will effect breast development because breast tissue in male and female humans is sensitive to estrogen and will therefore develop to resemble female breasts. But without some important parts such as certain receptors. Because hormones cannot magically create body parts.
Just like a male taking artificial estrogen doesn’t start having periods, because artificial estrogen has not magically created the fundamental differentiator for categorising sex in the first place. A male taking estrogen cannot ever produce a female reproductive system.
Changing secondary sex characteristics, changing hormones through artificial means, that doesn’t change sex. And it is a cruel thing if someone has been told that they have changed sex because hormones and surgery. A male body born is a male body til it dies .
Human sex is differentiated by whether a body is formed around the production of large gametes or small gametes. Not one person in the world has produced both types. If your body is formed around the production of large gametes, ova, whether they are functional or not, your body is female. Taking hormones will not change this.
A male human body will have cells that unless they have removed or damaged the testes, will revert to attempting to produce full male levels of testosterone once artificial suppression stops. In fact, artificial suppression, bar surgical removal, is also unreliable as has been noted in cases in sports.
Many, if not most, male people suppressing their testosterone only suppress it to a low male level, needed to maintain the male human body. It is not recommended to reduce testosterone to female levels even taking artificial estrogen.
It doesn’t matter how labguage is twisted, or how confidentially a statement is repeated. No human on earth can change sex, unless that person has changed the categorisation of human sex to suit their political and/or personal needs.
It does not benefit society to change this categorisation to stop reflecting material reality.