Why is the impact of Theia described as a Goldilocks scenario?

The energy and angle allowed for a stable Moon without destroying Earth

The term Goldilocks scenario refers to the idea that the impact parameters were precise enough to facilitate the formation of the Moon while ensuring Earth's survival. If the impact had been significantly more energetic, Earth could have been completely obliterated; conversely, if the impact had been too shallow, there would not have been enough ejected debris to create a large satellite. This precise balance of angle, speed, and size provided the exact conditions necessary to stabilize Earth's axial tilt and tides, which proved vital for the subsequent development of life.