There&#x27;s a history of reinventing the wheel in game development just for the sake of doing so.<p>Until Unity became popular, everybody was doing their own game engine for their own game. All those game engines have their own image formats, sound formats, archive packing format, etc. None of this is ever open source, of course...<p>And before you think &quot;in the name of performance&quot;, it&#x27;s usually actually in the name of premature optimization and ends up being a bad idea. Reinventing the wheel indeed.<p>Edit: I&#x27;ve been in the games industry (specifically, in reverse engineering and dealing with these exact issues) for a decade and this is all true, and from experience. I see I&#x27;m still being downvoted, without any reasonable explanations though. If someone here disagrees, I&#x27;d like to hear it.