Three years later I'm wondering, if the suggested "Group"-Feature has been implemented..?

You developers seem to approach the request by thinking from dev's perspective. You might rather just imagine the requested result, like grouping, which would not be hard to be implemented.. right?

I'm a developer myself and what you tell us about your architecture sounds a bit silly, no offense. I'm very interested to know, if there were - at some point in the past - a major requirement to cut your agility in such a bad way.

As said.. no offense.