Just to throw it out there, it’s not a matter of PtP being unworkable on the network, it’s a matter of why would you exert the mental energy to do make it work. Because if you take the base safenet, with safecoin being awarded to farmers for computation/bandwidth/data providing, you already have what you need to sell the app devs. Once you get the app devs onboard with effectively having a free back-end that can scale to the entire planet, you already have people creating the next facebook/google/etc. and from there, you already have mass adoption.
IIRC, the entire point behind App dev/PTP rewards is so that app/content producers can be paid for their work. A cursory google search however shows plenty of app devs and content producers are already making boatloads of money on the current internet, which doesn’t have a reward system built in. As such, both features are both unnecessary and will mainly serve to add possible weaknesses to the network that can be gamed or attacked.