#1 - The tech is there. Just has to get cheaper, which it will. Tesla's snottiest pig beats 300, and has the motors to eat 4kwh per mile (if tracked).
#2 - "100%/10min" -not any time soon, but like adding a partial tank in a hurry, a partial charge will add 100 miles in ~15 minutes, enabling a ~400 mile trip, soon enough.
#3 - There are more outlets, than there ever were gas stations. Pumping gas locally seems real inconvenient, to somebody charging at home. This one revolves around how often you drive long distance, and/or whether a look at places like www.plugshare.com
leads you to say "not enough".
WRT the OP, I'd love it if Porsche were both serious about the Mission E, and spent the money on an 800V charging network. Call it hearsay, but my unerstanding is Tesla spent ~250 million to bring its supercharger network through 2014/15. That really isn't much, relative to 2 billion. Some are speculating 150kw, which at 800v would cross ~100 miles of charge in under 20 minutes. Porsche/VW could optimize them for 800v, and forse all other non-800v cars to step down to the typical 400V DC fast charge rates (that's everyone else, at this point who even offers DCFC). That would double their charge times, and make people wish they had 800V capable ~VW's
. The fine line is between playing games which optimize for VW, and whether spending 2bb on the environment is really "promoting electric EV infrastructure", or whatever some are arguing isn't specific enough.