That's really not the issue. I could write you up a small story branch pretty quickly appropriately marked up for the variables in a sensibly encoded way - say Twine's code, just as a semi-decent example. Actually hooking that into the game as it is? Pure cancer. That's not on an inherent problem with heavily variable-dependent scenes, that's a problem with shitty code.People who think it's easy to hammer out content for a game like Newlife are ignorant.
The reason why people play this one over a ton of the other games is the depth out there--the fact that you can play a substantial variety of traits and variation of things. However, that also means that writing scenes gets very complicated. Scenes have to take into account all the different things you might be wearing, the traits you may have, your character's various attributes, which scenes you may have already been in.
Which makes it way harder to write for than a much more "on rails" game, but that's also why people want to play games like this and not the "on rails" games.
And if it's not a problem with shitty code? If it is actually as quick and easy as it could well reasonably be? Then it's just a shitty author who puts out barely any content.