The systemd developers don’t care about being compatible with anyone else (including their past selves) and are paid a full-time salary to make breaking changes, ermmm I mean work on, systemd. This is a battle that part-time volunteers cannot win. Or rather the only winning move is not to play.
I miss rc.local
Just came here to say that... sniff
You just scared me so I just checked and /etc/rc.local exists and works on my debian box which is running debian 10 with systemd...so what do you mean exactly by saying you miss it?