I can’t see how these requests would fit with Discourse’s core design/structure.
The post is the basic unit and the requests here propose changes to the core code that would effectively extend post features to multi-section posts or multi-post posts.
Multi-post posts should be rejected because it fundamentally alters the most basic structure of Discourse. While a plug-in could be developed it would add a new relationship that overlays the core structure and is, AFAIK, outside a key assumption assumption of every other plug-in.
Multi-section posts are a far more coherent addition to Discourse which is probably why they have already been mooted in relation to the TOC plug-in which, incidentally, only uses the first post in a topic. IMO multi-section posts would be a good plug-in for the few sites that really need it.