That hasn't really held true since the Roxxy update. Every update since then has added increased levels of complexity (pregnancies, the rig system, code reworks, etc.) and the time it takes for posing and coding has gone up significantly. The current problem is that the job for the tech update looks like this:
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They have to rework the entire teetering tower of barely functional Jenga blocks that is Summertime Saga's code base, as well as re-posing basically the entire game. The few glimpses they've given us about the process haven't given me much hope that they'll be done any time soon. I'm guessing this wasn't the original plan, but when they sat down to look at upgrading assets to widescreen they discovered how much of a mess there was.