For a replacement for cron...sure, that's nice too. The benefit of being able to manually activate a timer in order to test it is completely worth it.
For an NTP implementation? Eh. I'm not sure why that needs to be bundled in under the same umbrella as the service manager. It's also just an SNTP implementation, not full NTP, so it's notably feature-crippled relative to better options like chrony.
Network management? Meh. Again, that strikes me as something that should be loosely coupled to the service manager.
A UEFI implementation? gummiboot was assimilated and become systemd-boot. Was that necessary for technical reasons, or was it just moving a project under the systemd umbrella similar to how there's an umbrella of GNU projects?
Container management? Another place where systemd-nspawn doesn't strike me as notably better than the alternatives.
At a certain point "systemd" becomes a brand more than anything else, sort of like what IBM has been trying to do with Watson. Yes, it beat Ken Jennings at Jeopardy and that's great. That doesn't mean anything associated with the overall brand is automatically equally amazing.