all points into physique, and life on gear is DEF a thing in this game as well. Worse even. Gods Expac is supposed to rework phys/cunning/spirit a bit. Cunning and spirit are also going to give 1 hp per point apparently, hopefully making those stats a bit more viable.
there are a few things from POE that do not translate here. one is damage conversion. here damage is converted first, and exclusively.
Like in POE if you had a skill that does 100 cold damage, and have 100 cold to fire conversion. The you will deal 100 cold damage, but the damage is considered cold and fire for damage increases. Meaning, if you had 100% inc cold damage, and 100% fire damage, your 100 cold damage, would be increased by 200% as it is converted to fire, for 300 fire damage.
Here, if you had 100 cold damage 100% converted to fire, and 100% inc cold and 100% inc fire, the damage is no longer cold, so only the 100% inc fire applies. you deal 200 fire damage.