OpenRC is not well ported to Debian, they are not thinking on OpenRC as a full replacement of both SystemD and SysVinit, the current version available for Debian Stretch it's 0.23 and this version doesn't have openrc-init (replacement for init), even if you migrate to sid or testing you have version 0.34 and this version includes openrc-init and indeed OpenRC can work as a full init but this package doesn't include the scripts for agetty, or the symlinks for shutdown, reboot, etc. and this means some work and for sure some problems.
My point on one who wants to run a distro with full OpenRC it's to install Gentoo or some of their derivatives, and also some Arch based distros like Parabola (OpenRC version), Hyperbola or Artix.
