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I built a RPi-Distro using pi-gen a couple of months back. I still have to figure out how to enable wifi using systemd. There are lots of pieces here and there.

Earlier it was just one (config) file and one start/stop script.

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What does systemd have to do with your wifi? Handling that is the distro's job.

Systemd is part of the distro, as is the kernel and anything else you end up with on your machine after installation.

systemd-networkd handles network configuration.

For WiFi, you still need WPA supplicant or similar, but you'll have those two things playing together.

systemd-networkd is completely optional. In raspbian it is disabled by default and a very simple unit-file that calls ifup/ifdown is used. For wifi you obviously have to configure wpa-supplicant or use NetworkManager.

You asked what systemd had to do with WiFi. There are other options, but the parent wanted systemd.

Just install ConnMan instead.

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