Why Catadioptric Telescopes Are Suitable for Viewing Deep Sky Objects

You are saying the opposite. Catadioptric telescopes are not suitable for observing deep sky objects, but are more suitable for observing planets, the moon and the sun (Gabbard membrane).

Because the focal ratio of catadioptric telescopes is very large. The general Skajo ratio is about 10 (such as Celestron's C8, C9.25, C11), and the Macajo ratio is more than 12 (such as Boguan's 130 and 150 Macajo ratio). The large focal ratio results in low imaging brightness and small field of view, and deep sky objects have large visual areas and are very dark, so the catadioptric type is not suitable for deep sky objects.

To observe deep sky objects, you can consider apochromatic refractors (APO) for photography, and large-aperture DOB for visual inspection.