Not just that - if customers are already asking for an existing part, it's easier to sell them something that pretends to be that part than it is to convince th

Not just that - if customers are already asking for an existing part, it's easier to sell them something that pretends to be that part than it is to convince them to change to something else. They'll notice if you suddenly start shipping chips that need a different driver, if you're pin compatible and work with the existing builds there's a much better chance nobody will notice and you can pocket the difference in price.