Why did Saudi Arabia resort to using old ballistic missiles despite possessing an advanced air fleet

Exclusive Follow-ups – Al-Khabar Al-Yemeni:
Military experts and analysts considered that Saudi Arabia’s use of an old Chinese DF-15 ballistic missile to target Sana’a forces on the Marib front raises wide questions about the military reasons that pushed Riyadh to resort to a ballistic missile to strike a moving front, at a time when it possesses one of the largest warplane fleets in the region.
The experts pointed out that images circulating in recent hours from the Marib front showed what was said to be a Saudi use of a Chinese DF-15 ballistic missile.
They noted that Saudi Arabia possesses hundreds of advanced warplanes, including F-15 and Typhoon fighters capable of carrying out wide-scale strikes using large quantities of bombs and guided munitions.
The experts explained that a single F-15 fighter can carry several tons of bombs and munitions in one sortie, while a DF-15 missile requires preparation and launch procedures and carries a limited warhead compared to the payload that fighters can carry.
The experts questioned the reasons that push Saudi Arabia to use a ballistic missile to strike a front where forces and vehicles are constantly moving, while under normal circumstances it can send several aircraft and drop tons of guided bombs on the same targets.
The experts believed that there is a factor that forced Saudi Arabia to use the ballistic missile, represented by the pressures that the logistical chain on which the Saudi air force relies in the south of the Kingdom has begun to face.
They indicated that Sana’a’s attacks in recent days were not random, explaining that they repeatedly and precisely targeted bases and facilities of direct importance to Saudi Arabia’s ability to manage its aerial operations.
The experts noted that King Khalid Air Base in Khamis Mushait was bombed more than once with