Lost configuration of stopped daemon

[trots]

Hi,

The official FRR documentation says:

Daemons must be running for vtysh to be able to collect their configuration. Any configuration from non-running daemons is permanently lost after doing a configuration save.

In this case, when I stop a daemon for a while, I may lose the configuration of that daemon. It can be very frustrating if the config was large, for example. This behavior is not so obvious and looks like a bug. Like as a documented bug.

I understand that it is a consequence of the integrated configuration feature. And it works as it works. But I want to understand why this restriction was introduced, what were the preconditions, and why is this interpreted as the norm?