> In a blended wing body design you can have off-axis motion that can increase motion sickness

This sounds fixable in avionics and training. (Shallow, gradual banks.)

Note, too, that a larger lifting body needs to bank less to execute the same turn as a craft with more loading.

> Note, too, that a larger lifting body needs to bank less to execute the same turn as a craft with more loading.

This is not really helpful for passenger comfort. For a turn to be comfortable, you want the turn to be such that the effective force the passengers feel has no sideways (relative to the passengers) component, and the required roll angle is only a function of the velocity and turning radius. The aircraft design is irrelevant.

The Wikipedia article is mediocre: https://en.wikipedia.org/wiki/Coordinated_flight