Well, the damage bonus is just a nice to have (and in my current build a detriment when using a Yellowcake). When using a build that does not rely one just 1 weapon 99% of the time (which would basically be Yellowcake atm), the weapon swap speed is incredibly nice and you won’t want to miss it after getting used to it.
What would be really intersting if they changed the skill to add ammo to your magazine after swapping or have a minimum amount of ammo in your magazine after swapping (e. g. 30% of magazine size at 5). This would work well with Praemunitius and add a choice between weapon swapping and reload speed, while not encouraging forced weapons swaps for a damage bonus (which would for example happen when the skill had something like bonus damage for x seconds after swap; players would feel forced to swap constantly back and forth to keep the bonus up which would be just annoying)