Yes, programming content and testing it seems to have slacked off in recent years. But it beats no new content at all. If you were here during the time when we all feared the game was done, you might have more appreciation for the little bit we're offered, even with its glitchiness and unthorough gameplay testing. So try not to let it bother you TOO much. Having anything new at all is a blessing at this point. The days of waiting and wondering were very sad and stressful.
Focus more on your town designing, than on the gameplay that they offer us now. I do miss the days when each event was unique. Yes, its definitely the minimum offered now, being the same 4-hr routine every time; but it IS better than nothing at all.