There's a modifier that shows up on perks and profiles that improves "Restoration and Defense". For example, the Explorer profile gives
+15% Power Restoration and Defense
And the Engineer profile gives
20% Tech Restoration and Defense
That's completely unclear. I tried to figure out what it does. According to the gosunoob article Mass Effect Andromeda stats – what do they mean and do?, it has this effect:
Your healing and buffs, including protective powers (Backlash) are affected by this stat.
It's still not clear to me what exactly it does, or which powers it affects.
I assume that the Explorer buff affects eligible Combat, Tech, and Biotic powers, and that the Engineer one only affects eligible Tech powers, but which powers are even eligible, and exactly how are they affected?