I did say some after all. But yes, I believe that most may feel ashamed by such. Not every single ylian, but something that is culturally theirs. An entire race, whom has been on a single world for years; believing this sounds relevant to me. However, there could have been splits in this way of thinking. Just my two cents.
Here is the problem: keeping this as settings makes most PC Ylian aberrant from the norm. As someone who tries to keep her characters settings-compliant, I know I personally will be hesitant to play a Ylian if I have such a problematic settings issue to grapple with, because it preloads every Ylian character over the age of sixteen with obligatory drama. Repetitive drama, no less! After fifty rounds of "I am a social failure and a shame to my family!

" and another fifty rounds of "I'm a bad boy/girl who spits in the face of your marital conventions!

", it's gonna get
so boring.
It's just bad worldbuilding from an RP standpoint, sorry.
To be constructive, if the devs want to keep a marriage-equals-status thing going with the Ylian, IMO a better spin would be to have Ylian customarily not marry until they've established themselves in their jobs or otherwise built up a reputation in the community. (Making marriage a sign of status, rather than a requirement for it.) This meshes more neatly with how most people are going to play (i.e. leveling up a bit, getting to know some people, then maybe deciding to pursue an IC romance).