Why I don't ship "Chemistry" anymore
I do think chemistry is important for a roleplay relationship, but I think it's pointless to say that's what my ships are when chemistry is not my priority.
Once I saw the ship list for a roleplay and just about every single person on that list put "chemistry" as their sole ship. What's the point of even having a ship list, then? Chemistry used to mean something, but it just doesn't anymore.
When I roleplay, I wind up having a good vibe with quite a few people, but I'm not going to pursue all of those potential relationships seriously if my character doesn't agree. Sometimes, yes, I've wind up in ships just because I vibed very well with the player's style. But that isn't enough. Just because I enjoy the banter between our characters doesn't mean we're going to ship.
My characters have a say in their relationships too! Chemistry isn't a good reason for two characters with dissimilar views to get together if my character doesn't want to. My decidedly gay character isn't going to try to make the straight thing work just because of that weirdly imprecise thing called chemistry.
In a 1x1 setting, I even enjoy playing out stuff when I don't have chemistry with the other player and character. Some of the most fun I've had is when we grate and writing does not flow so easily. That's not conducive for a group, but it still can be enjoyable.
In a group, yeah, I'll only go for ships where there's chemistry, but I don't want to put that on my ship list if it isn't my priority. I find ship lists useful so I can clarify when my character has a preference for gender or I really don't like certain ships, but I'm not going to put "chemistry" down, if that's okay.