You're welcome! To your first question, it depends a lot on the preferences and on the situation. For instance, if you're someone who uses dating sites, people will often list things like preferences or deal-breakers on their profile. That way, people can see right away if there are things that they're looking for (or that they want to avoid) in a partner. Other preferences usually come up in getting-to-know-each-type conversations, or in more formal conversations about relationship expectations.
And yep, it's both okay and pretty common to have a preference decrease in importance when there's someone who you're otherwise really attracted to. Not to mention our preferences change at least a little bit throughout our lives as we learn new things about what we like, don't like, and what matters to us in relationships. Too, preferences aren't always as consistent as we assume they are. I even cover that idea in this article: https://www.scarleteen.com/blog/sam_w/2 ... _and_types