I never thought of Sisko and Yates has unhealthy, but I never found their relationship interesting or compelling. I thought Bashir and Dax, as a character who did not return Julian’s interest, had more chemistry than Sisko and Yates.
My god, what a day for epiphanies! I found their chemistry to feel phony, and they second guessed and low key criticized each other on every idea expressed. Better than Tom and B’Elanna though.