You confuse "not the highest performance" with obsolete. Flintlocks are obsolete. Abacus is obsolete. Pagers are obsolete (and even this is debatable, hospitals still use them). A gpu is still a gpu, and for as long as it can run instructions that the game is using and not as a slideshow it's not obsolete, just slightly (and more so every release) outdated. Also some people just genuinely hate any specialized form of input and don't touch controllers on principle. Understanding considering support for PC ranges from "sucks ass" to "needs to invoke dark magic and sacrifice goats to the dark ones"Real question, why do most streamers spend hundreds of dollars on a GPU that will be obsolete within months. An expensive keyboard made for typing to game on because it's got pretty lights. But they don't want to foot the bill for a joystick, a controller or an arcade stick? I mean it's obvious that most streamers don't seem to prepare but goddamn
Edit: You posted later about "new release". It's because they are actually adding new bonkers encoders that streamers specifically can use. And average vtubers knowledge of high-tech is way out of making a dual-PC setup for streaming where your game doesn't shit itself occasionally