Let's pretend for a moment that Role Actions were never introduced, having simply done away with Additional Skills completely.

How might each toolkit continue to provide the necessary functionality in job-unique ways (or at least through differently named skills)?
Note: If we consider immunizing every knockback, positionally compromising event, etc., for continuous uptime or ideal damage, rather than survival, as unnecessary, skills such as Arm's Length, True North, etc., do not technically need a place in the revised toolkits.