Utter rubbish people keep spewing out.
An in-game interface for the store was inevitable anyway given the browser for support features.
And why not, when it actually skips some tedious parts of the mount/pets purchase process.
Namely the realm selection and the need to enter a code.
And why not follow the battle pets example, with an extra link on the tooltip which much like the Pet Journal would display an in-game UI for the store items, showing you a 3d model and having a description to go along with it.
A ctrl-click preview of mounts/pets is long overdue anyway.