Mounts, for the common folk, are dispensable.
However, for a powerful being, a mount is an indispensable and important companion. Even when one ascends to the level of immortals, mounts are equally vital.
In ancient times, those mighty experts with profound magical powers each had their mounts.
Many, like Master He Shan, started to rear their mounts while their cultivation was still shallow, nurturing them over a long period.
"When one man gains Tao, even his chicken and dogs ascend to heaven."
This phrase is often used to describe how the relatives and friends of a person who climbs up the ladder benefit as well.
The earliest source is actually referring to Liu An, who, after successfully concocting the Immortal Pill, not only became immortal himself but also fed the elixir to the chickens and dogs he raised, aiding their ascension.
This is merely a legend.