Libinput is sadly one of the new breed of code, from the wayland crew, that is supposed to make things simpler (for who though, i can't help they mean simpler for them rather than for users/admins).

It is part of the code/project churn that i so wish the Linux ecosystem could get over and accept that one gets better software in the long run by continual refinement of existing code (no matter how crufty it may look at first glance) than constantly churning out new code.