But if you don't actually have gender dysphoria, then you don't need to use any argument in order to survive, do you? Absent some pressing source of constant and severe dissonance regarding your body, you can--not saying this is ideal, but you can--just blend in as your birth sex, right?

You can survive on rice and beans and cabbage. Not very exciting, but you won't die.

This is exactly the issue I'm trying to point out with the transmedicalist argument: only some asks are consistent with a transmedical-focused justification. When you ask for something inconsistent with the justification--just like if you are objecting to cafeteria food by saying "we need to eat to survive!" but they offer plenty of rice, beans, and cabbage--it makes people doubt that you know what you're talking about.

In the case of hunger, which everyone experiences, people don't then continue the blame for the bad reasoning by going, "Oh, starvation isn't even a thing." But in the case of transgender issues, which not everyone experiences, it seems reasonable (in the absence of knowledge) to continue the blame-assignment past the ask and all the way to "Oh, gender dysphoria isn't even a thing."

So I don't think the dumbing down is helpful. I think, rather, that it's actively harmful when there's a mismatch between the justification and the request. For instance, if the justification is all regarding severe medically-diagnosable dysphoria, then asking not to require a gender recognition certificate in some contexts (propagated to one's ID, of course) makes about as much sense as letting people buy opioid painkillers without a prescription.

If you want to buy a bunch of opioids but refuse to obtain a note from a doctor that you are in pain and suffering, you are probably up to no good, and very likely may not be in pain at all.

It is the analogous reasoning with gender declaration, for instance, that trans advocates have triggered by over-reliance on survival-level gender dysphoria.

So I commend you for (mostly?) using non-transmedicalist arguments personally, but I maintain that this is a pressing issue that is impeding trans acceptance.

Either asking for only those things with robust transmedicalist justifications, or using the justifications needed to fully support what is asked for, is a better way to go.