You've just never dealt with the technical side of translation. To get Chinese working properly on the Ren'Py engine, you need a ton of dedicated styles for it. And that's just the start—I spent up to 4 days just tweaking the fonts so they wouldn't break the ENTIRE game, while Latin and Cyrillic don't need to be tweaked at all.
And I'm not even mentioning the fact that the game sometimes uses custom fonts, which somehow have to be optimized and adapted for the Chinese fonts.
Long story short, it all looks super easy and simple from the outside, but in practice, very few people are willing to spend that much time on it. Plus, let's not forget that Chinese is considered the HARDEST among popular languages. You can see the quality of machine translation yourself—it turns the game into one massive misunderstanding for a Chinese player. And indie devs DO NOT have the funds to hire proofreaders or pros. All we can hope for is that native speakers will offer to help out of the goodness of their hearts (like it happened with me and other devs).
Should I even mention that Chinese players are restricted by their financial systems? This means a project physically can't get funding from the Chinese audience (and if it can, it's only after a ton of fees and effort on the player's part).
Hope I shed some light on this and answered your question. Look at it from any angle, and the problems sometimes outweigh the practicality. So all hope rests on enthusiasts, and us devs just have to optimize the software so it doesn't break from hieroglyphs.