The problem is the almost complete lack of documentation and all around knowledge. They have thrown out the baby with the bathwater even when there was no need to do so.
Example: https://www.google.com/search?q=%22systemd.timer%22 vs https://www.google.com/search?q=%22crontab%22&
Or https://www.google.com/search?q=%22systemd-networkd%22
All of this is fundamental stuff and decades of practice has been thrown away and it's not clear at all whether keeping backwards compatibility would've been so impossible.
