An optional mount is not the end of the game or the start of some slippery slope fallacy. Optional things have been available in store for years and years.
Personally, I could afford the original gold sink mount and did not buy.
I can afford this second cheaper mount and still won’t buy.
Will not buying it hurt me or my gameplay.
Nope, not in the slightest.
It is optional.
It did not require extra resources to make a reskin of an existing model.
It harms nobody and nothing about the game.
It is optional.