Well a NTC was not exactly what I suggested. I said you'll need a 
overcurrent/short protection for USB anyway, and a littelfuse/PTC introduces 
some "nice" welcome series R which even gets higher instantly on plugging in a 
device with high inrush current.

BTW bigger buffer C *may* make things worse, when ESR increases. Using a 
buffer C with low ESR is mandatory for the providing side (host) here, to 
minimize voltage dropouts.

Ideally you'd use dedicated LDOs for your USB out 5V, but yeah the power 
supply situation is sub-optimal there in M1.

/j
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