Caporegime
like the 290x now, why not have 4gb and 8gb versions, that could please everyone whatever your res
Because HBM is in it's infancy and there might simply not be a realistic possibility of putting 8GB on a card right now.
If no one makes an HBM product, HBM production doesn't start. If HBM production doesn't start, it doesn't improve, doesn't ramp up and stops being invested in. To get the next HBM product, you need to get them to make the first one, meaning you have to take what can be produced. Which looks currently like 128GB/s of bandwidth in 1GB stacks. There are yield(and therefore significant cost implications) of going beyond a certain number of stacks, meaning 4GB is doable, maybe even past the ideal number of stacks and 8GB could become effectively impossible at this point.
If there is no 8GB option(and considering 90% of the article is made up) it won't be because AMD actively chose not to offer one, it will be because it's not viable yet. But making HBM products today brings the date the 2-4GB stacks closer, making the next gen 8-16GB products more viable.