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

Simply put, End to End encrypts the data on the sender's device, and it is decrypted on the receiver's side when it arrives, so it stays encrypted for the whole journey. The only way to decrypt the message is by using the key that only the receiver device has.

Not to be confused with Link Encryption, which works similarly but is able to also encrypt the headers where the routing information is located (IP addresses, MAC addresses, etc). End to End Encryption does not do that; it encrypts the data itself, but not the header.