Ok, a closer look reveals the another possibly seventeen smaller bare die flip-chip packages, four connectors and already the above-mentioned mems structure so it appears that not so useless pinout.

65 i/o’s, 32bit timers? ridiculous huge considering its only (?) charging and those thick film chip resistors at the lowest 01005 sizes (up to date) where base size tolerances are +/-0.02m, crazy.