My wife has prepared a lot of these dishes in the past, but without a pressure cooker. So, what's different with the pressure cooker is that the cooking time for these dishes is much lower?
I would not even categorize the cooking time to be lower for many dishes (Because you will need the pressure to vent slowly for 20 mins unless you manually vent it). It is more of once things are inside the pot, you do not have to tend to it till it is done. The cooking time certainly helps for dishes like pot roast and it tenderizes tough cuts of meat much better without dehydrating them. Having said that, the above holds true for any well built electric pressure cooker. Instant pot is just a well built electric pressure cooker.
