It wouldn't surprise me if people uncovering issues (issues they most likely know about) is the primary reason we have no combat log.
I mean, with 4 different attack types (weapon, ranged, tech, force) and on top of that 5 different damage types (internal, kinetic, elemental, weapon, energy) and throw in armor and defense / mitigation effecting the various combinations differently... I'm sure there is plenty they want to ignore for the time being.