memfd_secret() in 5.14

Linux on laptops is probably a statistically insignificant minority of all Linux deployment. Number of people using hibernation is even smaller.
I think biggest deployments of Linux - mobile phones and cloud servers - do not use hibernation. No problem in accepting memfd_secure() for them.

I've written this comment on a laptop running Linux, but I'm aware of wider perspective. Incidentally, I haven't had need to use hibernation for past half a decade or so.