Decklists take a large amount of space on screen. Often, they are not necessary to the post but augment it. In an article or primer, there may be several decklists, making the primer significantly longer [looking] than it really is. As an example of this, the primer I'm writing on Oath currently has eight decklists so far. By volume, it is primarily deck lists.
Request: Make deck lists collapsible. The collapse function should be at the top (so I can skip the deck if I so choose) but having it also at the bottom would be nice.
Alternate request: A way to mark some section of a post as collapsible. This way decklists could be collapsible but other sections could too. The first use case I'm thinking of for this would be the pictures that appear in many tournament reports.