About product page layouts ...
AspDotNetStorefront always offers a storeowner a choice of 'display pages' for each product. We are showing you all the 'out of box' choices here.
When we carry out an upgrade, we anticipate upgrading a store where different products have been set to different layouts. Many of the 'old style' layouts aren't offered any more, and we can't leave an upgraded store in the position where many products don't display, so we ask you to choose ONE layout that will work well for your store.
Over time, of course, you can set different products to different layouts.