look like it starts to happen again: a replacement which is not ready
https://lists.fedoraproject.org/pipermail/users/2014-January/444565.html
https://lists.fedoraproject.org/pipermail/users/2014-January/444563.html
please realize that a drop-in replacement *first* needs to be *really*
drop-in and not "somehow like", otherwise all the things you may make
better are worthless
and yes "yum remove kernel" is a *minimum* to handeled properly
there are people maintaining RHEL5,RHEL6,RHEL7 and Fedora machines
guess how abused they are if they have completly different behavior
because dveleopers tend to call anything they don't like to implement
a "border case"