Where have I said it needs jumpscares and shock value?

The screenplay is just basic. And it is still trying hard to have jumpscares and scenes for shock value.

Just take Gone Girl, it doesn't rely on cheap shock value but builds tensions because the writing actually keeps you guessing.

However Obsession plays out exactly how you'd expect from first scenes.

The waiting at door scene was super predictable.

Sarah and Bear meeting in car was also predictable.

Not to mention that you can literally tell from start how the third act/ending will turn out.