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Is this the part that requires FFXIV username and password? Because IIRC it won't work if I use a security token.

then remove your security token silly. Its not needed anyways.

Respectfully, that is not a solution for the following reasons:
1) The previous launcher worked with a security token, so what you have done is reduce the usability for the new launcher when compared to the old one in this use case.
2) Requiring users to change their behaviors in order to have your program work as intended creates a poor user experience.
3) Belittling users for opting to use the security token is insulting. I hope that you didn't genuinely mean to insult me, but I am not sure how else to take your comment.

It sounds like this isn't the feedback you want to hear.
Your answer certainly implies that my concern isn't important to you, which is definitely not the answer I want to hear.
I would say this leaves us at an impasse, but realistically all this means is that you have one unhappy customer out of thousands and as such there is no incentive for you to change. So all that happens is I lose.