As a Roblox user it is hard to know what the game pass I am buying does, if the game does not already provide this. Most of the times the description gives good enough detail of what it does, but this is not shown inside of the purchase prompt.
As a developer, I have to provide space and support for showing the description of a game pass that is easy to read and always up to date.
If this was implemented natively, users would have a better way of knowing what they are purchasing.
There is no space on screen when this prompt is open on mobile to add our own description prompt view. The purchase dialog takes up a lot, as has a lot of potential space for this to be added.
