I have an automatic pressure cooker. It's awesome. I'd love a service that just delivered a package full of stuff to dump in a pressure cooker and nothing else.
The problem--and this is an issue with slow cookers as well--is that dump a bunch of stuff in and walk away doesn't work all that well for most recipes. Some browning etc. does a lot to develop flavors.
This seems kind of niche, but a service could do the browning in-house before they package and send the meal? I have to think a browned cut of meat would last just as long, if not longer, than a raw cut?
A company could do all the cooking in-house but these companies are all walking a line between "grocery delivery" and "freezer aisle food" and I'm sure they're all really hoping they don't accidentally step onto a slippery slope and wind up being "Hungry Man for rich people" (not that that isn't honestly a perfectly great company, it's just not sexy enough for VC money).