I would think that the first thing any developer, of these form of visual novels and games ( or even main stream games), learns, would be that being a developer is hard work... It's time consuming, requires various developmental skills with regards to the utilities being used, and if you want to make a good overall product then there is a certain level of innate or learned talent needed to succeed in the long term... Also, a developer needs to be open to hearing public opinion about their products... You can't please everyone, and you are your own worst judge of your own projects... This is because you have the inside scoop, you know what it took to make it, you know how the story was meant to play out, you know what your intentions were, and in essence you are innately biased to your own creations... Communicating your ideas and thoughts to the public (through your VN/Game development), in a way that makes sense and gets your ideas/thoughts across, when folks read/play your project, is not an easy task at all... The general readership/player base is a mixture of varying personalities, experiences, desires, maturity levels, reading levels, etc... Welcome all opinions, bad or good, and take in what you think will help, and ignore things you don't want to hear...
This niche of the porn industry is chopped full of mostly amateur level developers... This market's trends are also driven by that same fact... It's not the readers/players driving this market... There are literally dozens of new developers starting projects every month... It's also the reason so many projects are mediocre or poor in overall quality, and many never even reach completion... You have so many folks who may be enjoying one or more VN/Games they've read and/or played, and perhaps they become inspired to try and make something of their own... And with so many tools being made freely available that do not require as much technical expertise to operate, that also encourages more first time developers to give development a try... A minor few do really well, some do alright, many are just so-so, many more are poor, and a bunch completely fail or never even finish... That is the hazard that accompanies slow forms of piece mail development, which is primarily how this market functions... A vast majority of the developers of these things in the western market release their products content in small increments, typically taking years to complete, if they make it that far... It's not like the main stream gaming industry, where most developers work on a project for a long while and then just throw the game onto the market...
You can usually tell after a few releases, what level or types of talent some developers have when it actually comes to making content for these things... There is a certain level of forgiveness depending on the style of VN/Game being made though... Such as when a developer has poor story telling skills, but great 3D visual creation talent/skills, yet the project is being purposefully designed to be a meaningless porn fest anyway... Primarily intended for masturbation purposes... The general group of players/readers looking just for masturbation material would, in most cases, care less that the story sucks or the text is horribly broken, if the images and animations helped them get their jollies... Where as the primary number of players/readers out there, who are looking for some good story along side their adult/erotic/sexual content, would probably either avoid that developer/project, and/or be the few folks complaining about it... That's just one example...
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