If this ends up being a double post, my apologies. However, it seems I got logged out between screens and lost my original reply. Bolding in the quote is mine.
When someone starts building a project building, or puts it in their queue, no one else can build it.
It's ridiculous.
I don't necessarily disagree with you. On the other hand, I don't miss worrying whether a wonder I was building in the original Civ game was going to get finished or if I would get beat out by another civilization at the last minute.
However, they need to at least tweak FE's system before going to multiplayer. Otherwise, (human) players would abuse the system by putting world achievements in their queue just to block other players.