So gentlemen and ladies, for those of you who were not around pre internet, let me talk you through the process of buying something ( lets say a piece of electronics) pre internet.
You decide you want X
You drive to a store, tell the sales assistant ( usualy an idiot teenager) what you want.
Sales assistant then recommends a product , whether or not this is what you want depends on the level of idiot teenager.
You decide to puchase said product with really nothing to go on except ' salesperson said to' since you had no way to do any research.
' not in stock, come around in 3 weeks'
3 weeks later drive to store (again) to come collect you product.
Take it home
Only find out if and when it functions to what you wanted after paying for it.