Some people argues that not passing and castration are the main complain people have with trannies. I think its not that simple but rather a compound problem that involves looking at 3 categories of people: people that enable troons but only in a performative and superficial manner, then we have the transphobes and finally TERFs.
Also, let's simplify this and assume that perfect transition allows troons to become average looking women, so neither the bimbos they wish to become nor a margunally prettier freak that this time lacks 5 o'clock shadow Additionally we're gonna pretend that the deviants wants to become something other than a birthing person do not exists.
I'm leveraging too much ground toward troons in analyzing this case and they don't deserve any of it.
For starting, the majority of people that have problems with troons are not transphobes nor terfs, but rather the superficial enablers that will smile and say "trans women are women" but then refuse to engage with a troon because that shit gay. For those, if a troon had access to literal magic that would allow them to become true women, then I guess they may be able to change their mind, initually, but I also feel lkke there's a chance they'd still end up bailing for other reasons, and troons may not take it gently this rejection, associate it with transphobia and end themselves. In short: rejection would be still present at smaller numbers but higher chances of suicides resulting from it.
Transphobes are a different beast: It is less about someone's body and appearance but its more about everything else, from the personality (depraved) to the enviroment they generated and were generated from and while defenders will argue that its not all troons like this but a vocal minority that embodies all the negative stereotye we like to mock, I'd argue that stereotypes aren't unfunded and if people like that came to existence, there's a deep issue in trannies and tranny communities. I refuse to believe fully passing will ever fix these problems at all, if anything, it could further worsen the situation, if given access to perfect transitioning methods.
TL;DR: transohobes are there to stay.
TERFs will get split by it into a first faction that will argue that now trannies are are real women and that the issue is fixed, while the other will scream that this made the situation worse as it's now impossible to distinguish which is a woman and which is a man. Their goal will now be keeping thenselves united by convincing the first faction of TERFs that's changing team to remain and support the cause, as well as find a way to justify their own existence to the rest of the world without sounding conpletely insane. If neither of it can be done, then the Homo TERFus will go the way of the Neanderthal.