Overall, it reinforced that they are interested in someone who is willing to take a below market rate, is a generalist in many arenas, and is willing to work 60-80 hours a week, including 24/7 on call.
Honestly, breaking the job into 2 positions (no, they would not be reading r/aww all day, and if they were, you hired the wrong people) would make this SO much more enticing. It would eliminate the 24/7 on call (you could do every other week), you'd have someone to bounce ideas off, and if you hired the right 2 people, their expertise in the 4 'jobs' would likely be much higher than whoever is going to get the gig currently.