Hi, I guess you can find plenty of discussions on this list on this topic so I won't rehash. Just to say that there has never been a convincing use case that is not easily addressed with description lists and inline tasks. The former can be made to look like encapsulated sections on export with appropriate customisation of the various export targets.
I suggest you check out the list and think about your actual use case. -- : Eric S Fraga (0xFFFCF67D), Emacs 24.3.1, Org release_8.2.4-322-gece429