That is a popular fan interpretation of Jadzia. I can see some similarities, but I don't think the Trill are even as much as an allegory for transsexuality. That interpretation is very reductive and dismissive of the transsexual experience.
A gay interspecies couple
Garak and Bashir were originally portrayed with gay subtext. Producers put a stop to that before anything actually developed between the two characters.
In TOS, there were more characters in red shirts than any other color. So of course most deaths were characters wearing a red shirt. Proportionally, I believe it was actually yellow with the highest mortality rate.
I thought that was pretty standard for actors depicting a character eating. I remember how Aziz Ansari found it notable that Chris Pratt did not do so on Parks and Recreation:
He always also never uses a spit bucket. When you do scenes where a character is eating, you eat and then spit it out into a "spit bucket." Chris just keeps eating. If you see Andy eating a cheeseburger in a scene, you should know Chris Pratt ate like 8 cheeseburgers.
With transparency