Still thinking about plumb vs extended bows, I came up with the following thought experiment: Take a Nordkapp Low Volume, and/or a Current Designs Solstice or Nomad GTS, all very different designs. Bring them into the shop and remove 6 or 8 inches from the bows, faring it up smoothly.
Would a paddler even be able to tell that the boat was shortened? In what conditions? My guess would be no. I had a Solstice GTS for over 10 years and do not recall its extended bow ever in the water, except perhaps exiting a surf break. But it has been a while and my memory might be hazy.
Note that removing those 6 inches has zero effect on rocker. The Nordkapp LV has high rocker, and the Current Designs boats have low rocker, all completely unaffected by modifying the extended bows.