All of the physics messages (OnTrigger/OnCollision) still work with no parameters. Eg:
private void OnTriggerEnter() {
//This will get called whenever OnTriggerEnter(Collider other) gets called
}
I haven’t tested every single message, but I believe the version without parameters works for all of them. These versions of the message are not documented, though.
Skipping messages like this is a particularly large problem - third party code tools can check both the public API and the symbols for methods, but they can’t know about undocumented magic methods. In this case, this leads to Rider’s plugin not recognizing any of the methods as MonoBehaviour messages.