Left this comment in the other thread too, but posting here for visibility:
Quiblr should now have each of the markdown criteria fixed. Huge thanks for the feedback and for all this analysis. Consistent markdown is important for a great and consistent user experience across the lemmy ecosystem
Thanks for the Quiblr compliments! And Post and Comment links should now open in-app. I think that covers everything
And Quiblr is a PWA. Native apps are in the works