Kind of, If martials took the trap options they were in trouble. There were some trap options for casters, but not nearly as bad and being a full caster compensated for a lot.
I'm not sure this centers so much around builds as around the fact that 1) Most monsters don't actually hit all that hard (most) and 2) PCs don't stay down, because there are no RAW penalties for bouncing up from 0, it's too easy to just spring back up (with the very small exception of an early level big critical. Ironically, the first hit of my very first 5e session involved me critting the mage for max damage with a heavy crossbow. Full to dead in 1 shot, set an interesting tone for the rest of the time!)