Yep you can do that Matt but if you happen to not harvest them one season, the straw, as it rots, will create a fungus (whitish/gray) – and you will have a much reduced and sometimes inedible (fungal/diseased potatoes) crop. At least that has been my experience. I can only speak from that. If you add more light matter/nutrient mix (rather than simply straw) – it is still very easy to harvest them (the soil is light as can be – it is not a wet it and crunch your fist and it retains a shape) and the added, easily available nutrients from the mix will give you bigger and more of the crop. Again, my experience. And, BTW, thanks for persisting enough to follow that ramble!