Hello!
The frustration you've expressed is shared by many PC players. The reason some games allow console players to disable cross-play while PC players can't is a design choice to address the competitive difference in input method. A mouse and keyboard offer a significant advantage over a controller, and by giving console nel net players the option to opt out, developers aim to protect that large player base from feeling at a disadvantage. This is a strategic compromise designed to maintain a healthy and viable matchmaking environment for all platforms.