The main problem tree reviews — if they become many, it is very difficult to do a sane breakdown of the add on page. And it's good even if the server is powerful and the engine is well-written, and often wait for 10 seconds until the page is formed, and the same, to boot. If they are paged, it becomes difficult to follow the discussion, which is conducted in different branches. Someone solves this problem by pruning branches and uploading thereof on a click, but to put it mildly, not conveniently.