systemd-homed.service(8)
https://systemd.io/HOME_DIRECTORY/

At first glance, it seems to be another thing that "ridiculous but a little bit usable". Actually I have no special feelings about such new things. However, when I saw the JSON word in the introduction, I immediately realized it was not only far from usable, but also pure garbage.

Let's take a step back, I'm not quite sure if the other things good or not, they might be useful in some circumstance. But the JSON must be the nightmare IMO.