Sample of using reactive model instead of direct references

ModelExample.cs

public class PlayerModel
{
    public ReactiveProperty<int> Score { get; } = new();
}

public class GameModel
{
    public ReactiveCollection<PlayerModel> Players { get; } = new();
}

// PlayerSpawner would be the one that placed in Scene
public class PlayerSpawner : MonoBehaviour
{
    // Injected from somewhere
    public GameModel Model { get; set; }

    [SerializeField] private Player playerPrefab;
    [SerializeField] private ScoreUI scoreUIPrefab;

    public void Start()
    {
        // You'd also manage unsubscribing in real game
        Model.Players.OnAdded += SpawnPlayer;
    }

    private void SpawnPlayer(PlayerModel playerModel)
    {
        var player = Instantiate(playerPrefab);
        
        // inject to an instantiated object
        player.Model = playerModel;

        var scoreUI = Instantiate(scoreUIPrefab);

        // inject to an instantiated object
        scoreUI.Model = playerModel;
    }
}

public class Player : MonoBehaviour
{
    public PlayerModel Model { get; set; }

    public void ScoreGain()
    {
        Model.Score.Value += 1;
    }
}

public class ScoreUI : MonoBehaviour
{
    public PlayerModel Model { get; set; }

    [SerializeField] private Text scoreText;

    private void Start()
    {
        // You'd also manage unsubscribing in real game
        Model.Score.OnChanged += UpdateScore;
    }

    private void UpdateScore(int score)
    {
        scoreText.text = score.ToString();
    }
}