What WAS changed is that you cannot fire twice in one action phase.
You can, with multiattack.
It was changed to balance thing and to help even out combat.
Guns were simply too powerful.
Guns are. Life's unfair. Overbalancing things that are not balanced in real life is a MMORPG disease. It has none to do with real RPG. Or at least, should not have.
And Guns were not so powerful, compared to spell, as spells bypassed armor (mostly), could prevent from being hit by said bullets, and so on.
And with differences in pools for close combat, I guess it was quite balanced with guns for damaging ability.
Firing a bow was effectively a complex action
Bows are slow, that's a fact.
Which meant you fired twice, doing a boatload more damage.
Against boatloads of armors. How much could you stack, with gel, form fitting and so on? Helmet even gave bonuses!
And since frequently the guy using guns was also the guy with 3+ initiative passes, it really bogged combat down, espeically if you weren't a gun guy with multiple passes.
Yeah, while invoking a spirit and letting it wipe the floor for you is not unbalanced, especially because the spirit will be even more unkillable since you will do overall less damages, and will still be really fast and full of metacreature power that have not been nerfed down.
But hey, now it is same lenght actions, I guess it will be better to throw grenade belts around instead of packing this Ares Predator V;)
The idea was to flatten out the overall combat curve a little bit and to help keep everyone in the game more often.
Not sure it is the result.