Comment by megous

But all I want is to not have login prompt processes (getty) wait for seemingly unrelated things, and start as soon as possible.

In a friendly system, I'd just edit the getty service config and change After/Before/whatnot and be reasonably confident I didn't break anything. But

1) it's not possible, you can't just override After/Before alone.

2) systemd doesn't make it easy to inspect existing relationships in a simple to understand, localized manner in the first place. So unless you're the one that wrote all units in the system, getting a concept of what you'll possibly break by changing things is almost impossible, without just rebooting and seeing if the system will start up.

You can create a massive SVG of dependencies from systemd-analyze, but that's really not that helpful. It's a picture that has at least 10 meters on one side. :D