The concept of runlevels actually is restrictive. The BSD rc system doesn't have them, for instance. It's a messy relic from SysV. The BSD and systemd methods o

The concept of runlevels actually is restrictive. The BSD rc system doesn't have them, for instance. It's a messy relic from SysV. The BSD and systemd methods of initialization let you define any arbitrary system state (grouping of processes) as a runlevel. I wish this author would stop writing articles, as they're only undermining the arguments of the anti-systemd side and providing ammunition to lump everyone in it as uneducated Luddites.