I think Systemd has a view that those things should reliably work together. I do not fancy a revival of the past where the user has to cobble a mesh of hopefully compatible libraries to achieve the same, taking weeks to study the Arch manual and resolving tons of gotcha's, all to be broken by next week's update.
The integration of all this stuff is now actively under test and maintenance with systemd.
And yes, the mentioned services also have an impact on the scope of service managing. Because if you have a unit that depends on a disk that needs to be unencrypted, this has to be resolved somehow in the right time.
I personally have had no need for systemd-resolved, but I think for *desktop* the list of droppable components is not large.
So maybe we should first have a conversation about the *desktop* vs *container-os* purpose?