Of course transitioning is a choice. I DARE anyone to throw a brick. I triple dare you.
OK, now that, THAT nonsense is over, lets put it in context.
Everything in life is a choice, including staying alive. You can always choose suicide if that doesn't work for you.
Transitioning for GID afflicted people is a choice, but it is more akin to an ultimatum, ala:
Guy has a heart that is 90% obstructed, and he is only given a short-time to live.
He can choose to do nothing and die, or he can choose to take a treatment in the hopes that he will live.
Transitioning is a treatment alove all else. It keeps people alive. It doesn't solve all of the problems that person might have, but neither will an angioplasty for the guy in the analogy above. It is used by the medical community, and it must be valid, or they would quit using it as part of the treatment regimen. So, transitioning is not a lifestyle choice so much as it is part of a treatment regimen.
Now, there are plenty of people that can and will refuse treatment for any given medical condition. Or they may choose part of the treatment program and refuse others, like my Mother has done. People with a bad tooth might go in to have it taken care of, or they may wait until it is either falling out, or infecting the whole body. The choice seems simple, but for some people, the pain of the treatment is immediate and scares them into refusing the treatment, therefore making the problem much worse down the road. And nobody can make you do something that is good for you ~ i.e. transitioning ~ if you are afraid of the regimen.
The devil you know is safer than the devil you don't know, at least that is true for some people.
So, yes, transitioning is a choice. It is a choice for a better, healthier, safer life. It is a choice not to fall into the grips of the medical condition, and an attempt, a choice, to try and get better. It is also an acceptance of your condition. So, for some people, the inability to come to grips with their situation causes them to deny they have a life-threatening problem. Even when they are depressed and suicidal. It reminds me of my drinking days. You can't get help until you are able to admit that you have a problem and need help.
Most medical conditions are more easily overcome by younger folk. So, it is no surprise that when a person is diagmosed with this medical situation, that the younger the person is when they first seek treatment, the better the results are, and the more likely they will have a positive outcome. The older a person is when they first seek treatment, the more likely that the condition will have progressed in a negative fashion, and so it requires more agressive, expensive, and invasive care to get back to a positive outcome. Transitioning is no different.
Hopefully, someday, when all of the politics are squeezed out of the mix, then people can seek out and get treatment as it is needed, instead of when it can be afforded.
Of course, that is just my NSHO.
Throw a brick, and I will crush you like a bug.