It’s good because they have spent hundreds or thousands of hours polishing and improving it. It’s paid off too, because stable releases never have broken data files any more. Any mistakes that do get made are usually found and fixed before the code is ever committed. Even the experimental branch rarely sees broken data files. It’s more likely to see these error messages when loading save files, because the code to read old save files and convert them for newer versions of the game is the hardest to write and test.
> And a 3rd party library would be just some code taken from the web, or some proprietary solution where you'd once again have to trust the vendor.
Open source exists for a reason, and had already existed for ~15 years by the time this game was begun. 20 years later there are even fewer excuses to be stuck using some crappy code that you bought from a vendor and cannot fix.
