Hi. I am another boring person who ships Ninian with Eliwood and Hector with Lyn.
Ninian x Eliwood is just my favorite of the implied canon Lord ships throughout the series. The way it integrates the story into the support, and the tragedy of the scene after Eliwood gets Durandal puts it over the top. It feels genuine and impactful, and the brief happiness of the ending makes me so happy despite the fact that we know it doesn't last considering Binding Blade.
Lyn x Hector is a bit harder to explain, just due to the fact that I usually don't like ships with where they argue a lot before they hook up. Part of it is that of all of Hector's ships, it had the most romantic feeling support conversation. It also helps that they have the scene on the boat together. I also kind of like that in this ending Lyn actually doesn't go back to Sacae. I get that her going back to the plains after Hausen's death makes a lot of sense, but personally I dislike the idea of her just passing it off to Hector. To me I think it joining Ostian protection as part of their marriage paints it in a better light. That and having two unconventional nobles learning together is kind of cute. Overall, Hector x Lyn just became my Fire Emblem OTP out of nowhere and I've actually paired all my Hectors in Heroes with different versions of Lyn. Oops.
Personally I don't care which pairings are canon. It helps Ninian x Eliwood a lot, but that's because it is woven into the story well. There are plenty of pairings that are canon in FE that I don't like just out of personal preference. So while canon couples sometimes feel better just because they seem so natural, I don't think for me that the canon pairings are automatically the best. So I'll probably prefer Hector x Lyn to their other options even if it never gets canonized or other pairings like Florina x Hector and Rath x Lyn would.
