It might help if we had some idea how fast this newfangled Warp 13 really is.
But the funny thing is, it's something both a meek hospital ship and the pimped-up E-D use - the former for getting from H'atoria to the Neutral Zone fairly fast (another Picard conducts a similar trip in the older E-D at Warp 9, which is very high for that ship), the latter for getting out of the (former) Neutral Zone as fast as they possibly can.
Why is the semi-comfortable long range cruising speed of a hospital ship the same as the super-serious emergency maximum overwarp of Admiral Riker's favorite warship?
Perhaps because these are indeed new power consumption minima, high up there, but fairly sparsely spaced in comparison with Warps 1 through 9? Thus, new ships can reach Warp 12, and most of the decent ones can do Warp 13 (and would not benefit from going a tad slower, because Warp 13 is a local power consumption minimum), but it really is impossible to reach Warp 14 with mere 25th century tech (and there's no point in doing Warp 13.1 because that's almost as impossibly costly)? This in contrast with the 24th century where it's possible to improve from Warp 6 to Warp 7 with relatively modest investment, and then further to Warp 8 and Warp 9, too, because those aren't so greatly separated.
Timo Saloniemi