There is millions of mods out there for than just minecraft, MOST do changelogs. MOST do not get paid. A sticky here or there or a note would help.
There are notes here and there. But focussing this and summing everything up efficiently needs some work. If the team gets used to everything and improves on efficiency things will get a lot more struktured. I personally believe that everyone is doing his/her best or even more, which is enough. And actually there are some parts that improved a lot and some of the issues are more related to mods, which makes it hard to give information about fixes.
A changelog is nice, but I actually believe that they fix as much as possible and hope for a bugfree release with all the required features. So I don' really care if something is fixed in 1.06 or 1.07 or such as long as it is fixed as soon as it is possible.