Edit: yep.
I've used other PDF viewers (Evince, xpdf, gs, mupdf), and tell you what.. I've come across PDFs they cannot display properly.
If I have to rely on others implementing things for me, and there is concrete evidence that others have trouble doing it, why would I rely on such a format?
Do you also implement your own OS from scratch, or do you rely on others?
Every FOSS OS I know of has patches coming out on near-daily basis.
No, not today. Maybe in the future, who knows.
But I try not to depend on too many things and people, if there's a way around it. I like to have control. That's freedom to me, and freedom gives me peace of mind.
So, no, I don't see why I should waste my precious free time improving software support for a format that I find way overcomplicated and just plain silly. Why should I?