I can't really decide if this is a good idea or not. The year is 1555 and I have Japan fully annexed. It's pretty boring event wise, mission wise and I think the shift might change that, but I don't want to do it just for fun.
Would shifting to Japanese make a -5 stability hit worth it, just for events/missions?
On a side note, when would it be worth it to reform the government? I've found no good reason to do it yet.