Board Thread:General Discussion/@comment-63.175.124.6-20140826225745/@comment-14600979-20140826231703

Torches would involve expensive lighting calculations, something that just won't happen. Crafting was/is being worked on but would be very limited and items aren't really necessary due to mobs being hard to implement believably. Just look at how slimes turned out. Beds are useless, with no mob spawning algorithims, crafting menus are graphics, and would involve making dozens of new things, involving data table creation and possibly requiring a partial rewrite of the engine. The reasons that the building limit is two blocks should be obvious. To my knowledge, water is being worked on, but note that IAmAPersson gave up the proect ot pursue other languages. Caves don't make sense due to all the previously stated limitations.

"A wall is a structure that defines an area, carries a load, or provides shelter or security." (Wikipedia.org)

I'd say the wall is the engine, which he very much does have. Adding windows keeps the structure "safe" while improving functionality. The items you listed, especially commands and nicknames, are very separate from the engine and don't require excessive effort to implement.