You are wrong, the old Version has a bad code because multiple Coders that worked for this game over the years made their own thing. The old Version is so buggy that if Dark Cookie would continue with the old Version, he would break the Game completly overtime after a couple of Updates like Rhonda and Annie Story. That's why the tech Update is made in the first place.
But Dark Cookie used the Situation to rework existing Content to 16:9 and making new content for existing Characters. Yes, Dark Cookies Workflow is Bad, the Updates have too little done. Dark Cookie should work much more. But continuing with the old Version would just be worse.
Even People who mad Mods for the old version said that the Code is trash.