[ilovecookiestoo]

> It would make sense if systemd delivered on its promise of automatically detecting service dependencies (through socket activation mechanism).

New features require time to gain wider adoption. Some services already support this, but most don't (yet).

[dozzie]

This particular feature could be (quite easily!) implemented without much help from the daemons themselves, at the cost of duplicating the config option of listen address. To make the matter funnier, this is doable with mechanisms that were adopted in unices in '90s. This is why systemd underdelivers on its promise of automatic dependency detection.