Thank you for your quick reply and the precise answers, Eric.
Comparing org-export vs. org-tangle I've mixed up how I used text
processing:
* for myself I often use it simply for creating codefiles (tangling) -
org-export would be sufficient
* for tasks in office there is need for creating a nice doc file, too
(weaving) - org-babel for code creation
Thank you for making that clear to me.
I will revisit my nebulous feature request of calling blocks inside
blocks - there is no actual need, as you identified.
Greetings,
Olaf