systemd is not a monolith.
It's a collection of losely coupled components and services of which basically every single one can be disabled or replaced by another implementation.
In theory. In practice, systemd is a mess of different components that have subtle dependencies on each other. And while the core of systemd is solid enough, everything around it is not.
It's a collection of tightly-coupled components that are functionally a monolith because large distros tend to rely on the various components rather than allowing modularity.
No it definitely is a monolith.
It's NOT loosely coupled in any way. Try running any part of the systemd software suite on an openrc system and see how that works out?
I have no idea why people are so insistent on claiming that its not a monolith, when it ticks off every box of what a monolith is.