Sven Hartge:
systemd happily runs "legacy" LSB init scripts
... except when its one-size-fits-all approach does not work, of
course. Example:
* https://unix.stackexchange.com/questions/386846/
This is the problem with even Mewburn rc scripts (as I can attest from
personal experience of writing replacements for an entire Mewburn rc
system) let alone with van Smoorenburg rc scripts (which are far messier
than Mewburn rc ones). One size does not fit all. One really is not
going to ever get a backwards-compatibility mechanism that copes with
all such scripts in the general case "happily".