I think a possibility of highlighting sections of the text, equations, or code in the posts by the community members might add to the quick-readability of the questions and answers. I mean a mechanism similar to what is currently possible in Medium:
More succinctly, community members would read a post and highlight some parts. Such highlightings will be visible to any viewer of the post. A highlight has an owner (its creator), and can be removed by its owner or the moderators. Moderating highlights will not be a burdensome task, since highlighting does not entail a modification of contents (as for editing), and no mistake or offence is possible -- only there could be inept highlighting by some user.
This could be a feature that can be turned on and off by a viewer. Generally, it would help a viewer to get an idea of the major points of a post (question or answer) from the highlighted sections provided by the community members.