The enthronement ceremony was very grand, but it was mainly symbolic.
The Saiyi Imperial Kingdom had already been defeated and disarmed. Tens of millions of Saiyi people eagerly awaited the Empire's aid. Whether it was enthroning Emperor Xia or dethroning him, it only added slightly more trouble such as needing to deploy more troops to suppress potential riots.
Regardless, in the hearts of the Saiyi people, Emperor Xia was the spokesperson of the Heavenly God and the supreme ruler of the Saiyi Imperial Kingdom.
Dethroning Emperor Xia or even annihilating the Saiyi Imperial Family were not difficult tasks, but suppressing the potential riots was an arduous and thankless job.