If there's any area Lu Xuanyu needs to focus on, it must be "mounted martial skills."
Although there are similarities between mounted and foot combat, a general skilled in riding won't become a second-rate fighter on the ground. But that's all there is to it. Even a mythical novel like "Water Margin" knows to strictly distinguish mounted generals from foot combat experts.
For Lu Xuanyu, "horse control" was inherently challenging to practice. Most of his day was spent on "practicing martial arts," leaving little time to bond with a horse. In this respect, his gap with professional riders would only widen.
However, Xiang Shan solved this issue in an unexpected way.
That was, of course...
Prosthetic Body Horse.
The standardization modification surgery for mammals is already quite advanced. Superman Enterprise's research over the years has been mainly about achieving a 100% success rate in human standardization modifications.