“I already get notifications from my phone, my email, and my calendar. Why would I want another source of pings?”
Because those don't know your deal. A calendar reminder fires whether or not the closing already happened, the contingency already cleared, or the offer already got accepted. PREP alerts read the live state of the deal: they stop firing once the work is done, and they only exist for deals you're actually on. Fewer, and each one means something.