Why would banking be a problem for passengers on the Flying-V aircraft? In this article, the author raises doubts about the viability of this aircraft:


  Sadly for the Flying-V, it will probably fail like the blended wing
  body designs we've seen down the years. It's for the same reason, too:
  airplanes bank as they turn. That's not much of a problem in a
  conventional airliner design, where passengers are never that far from
  the plane's central axis. But as you move further out from that
  central axis the effect becomes a lot more pronounced.



credit: Edwin Wallet, Studio OSO

I don't really understand how banking is a problem. The angle for the passenger remains the same, the only difference being an increased of vertical acceleration when the airplane is initiating / retracting the bank.

An apparent simple solution would be to... bank more slowly...

Is there something I'm missing?
Would the vertical acceleration really be a concern for passengers?
There are two possible sources of discomfort for passengers sitting farther away from the aircraft's longitudinal axis during a roll manoeuvre:


At the start and end of the roll manoeuvre, the angular acceleration will be felt as a stronger vertical acceleration, as you pointed out (vertical as in perpendicular to the cabin's floor).
Between the start and the end, the aircraft will be rolling at constant angular speed (or roll rate), so the angular acceleration will be zero, but the passengers will still be moving along a circular trajectory (around the aircraft's longitudinal axis) and therefore will also be subject to a centrifugal force (parallel to the cabin's floor) that grows proportionally with the distance from the longitudinal axis.


The roll manoeuvre itself may only last a few seconds, but if the above effects are strong enough, it could be enough to make some passengers feel properly queasy, especially if it's repeated a few times as during departure and arrival procedures.

As you suggest, rolling more gently and more slowly would limit these effects. However, instrument flight procedures always involve standard rate turns, with turn radii expected to remain within certain limits, depending on the aircraft's speed. Rolling more slowly would increase the aircraft's overall turn radius and could make it harder or impossible to comply with currently published procedures.