Fl4k - 3 possible builds, can they survive m3?

I have all guardian ranks except the last two in the healer tree - and that’s because I’m not sure if they couldn’t be counterproductive for certain characters or playstyles? I haven’t looked into Moze’s or Zane’s skill trees deep enough yet to know if they have bonusses dependent from low or down shields (I think Zane has??), but if I ever decide to play my Amara melee again??? I wish we could “equip” those skills in the guardian rank tree depending on character or situation.