I fail to see what's annoying how. OrderedDict provide features for manipulating ordering, but they are expensive and slower. dict initially became ordered as a consequence of implementation details changes, and that was considered useful enough (or likely enough to trigger compatibility issues with third party implementation) that the core team decided to standardise it rather than break it (one of the advantages of the new implementation is iteration performances, shuffling iteration would probably have slowed it back down more than the old implementation)
Annoying is that it is not obvious why the two exist, by their name. They are both ordered. One is orderable in that you can change is order. I would not guess that looking at this.
For a language that prides itself on being readable, that is an amusing quirk.
