PCs are way more diverse than consoles.

When you make a console, it has the exact same components everywhere. PCs, on the other hand, can be very different from each other, having different components, different operating systems, and many other factors. This makes it way harder for developers to properly test their games for each different system, leading to more crashing and performance issues. That's the reason why many games on Steam are released as Early Access, which can help detect as many bugs as possible from many systems with the help of the community.

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This is the first thing that comes to mind