Couch Co-op Java

Java edition for computer needs to have a split screen/multiplayer option. Having multiple people play on one console and screen is easy on console bedrock. Why can't it be he same for Java? These days lots of people connect their computers to large high res/high refresh rate TVs and use them for everything. We shouldn't need to try to download all the bs (MultiMC/Nucleus/controlable) get and share IP and after all of that it crashes the game or doesn't work with resource packs and shaders we've purchased makes this version of minecraft a huge failure. We've decided to quit on all systems. Maybe we'll return if this issue ever gets resolved.