OpenSSL doesn't handle it any better. As per Matthew D Green "It's like asking whether the crew of the Space Shuttle should have parachutes to protect them in the event that the shuttle explodes. OpenSSL says 'yes,' LibreSSL says a better idea would be to prevent the shuttle from exploding in the first place".

LibreSSL isn't even production ready yet, getentropy_linux.c is still in the tree getting worked on, and the sysctl method works (for now) with (most) linux kernels as a failsafe API to gather entropy while inside a chroot/file descriptors exhausted.

For all we know next month kernel.org could roll out a new failsafe API for entropy collection and finally kill off sysctl.