Put pain points of current architecture into writing

[In-Ko]

Description

In order to design a better v2 architecture, we should put the pain points of our current architecture into writing, so that we can check if the new design is actually solving our issues. If possible, write it down in the style of an ADR and put it here: (add Link to ADR Folder here)

[In-Ko]

@ValentinGerlach If I remember correctly, there was only a tiny follow-up left for this task. Can you add it here, so that we can close this issue please ?

[ValentinGerlach]

Task is done. The ADR will be published together with #29