Having Kronos 2mins away from Earth at warp is, well, idiotic. Why bother with a neutral zone when both worlds are now next door to each other? Klingon surprise attack by its entire fleet based at Kronos would be straightforward. It should be days away at least. Preferably weeks! It contradicts everything in Star Trek so far.
I expect the next movie will get to the centre of the galaxy in say.... 10 minutes? Why not? Why not nip to the delta quadrant in 20 mins? If it serves the plot and the pacing then so be it.
While I agree that TOS cocked up speed and distance on more than one occasion, particularly since shuttles seemed to have no warp capability, the movie has opened the can of worms even wider. Often the distance was arbitrary and it was a case of the writers just being careless about their numbers. Enterprise was the exception and look at the fuss there. The implications are huge.
In the last movie, Scotty was able to home in on the Enterprise's Federation beacon to beam on board. Exactly what was Harrison locking onto on Q'onos? It may be that S31 had set up a beach-head receiving pad in a deserted area to avoid the signal being detected but if not the distance (20+ light years?) makes no story sense.
But why does transwarp beaming even matter if you can travel there physically with 500 times the man power in 5 minutes? Why travel there at all if you can just beam weapons to your location like US Drones? Why have a war at all, when you can just beam your 72 warheads straight to the Klingons' key military targets.
And Scotty was proud that he beamed 3 targets from 2 locations, but Harrison beamed 72 targets in one go using an automated transporter!
Plot convenience is a nice excuse but if you have to use it over and over and over and over and over, it's a sign of a very poorly considered plot.