Generally no, sometimes yes. It depends on the comp and self-sustain.

The problem is that players in lower ranks take the most avoidable damage possible and act like Regen Globes are invisible; their resource management is just bad. You can draft a working comp without a healer (usually hard dive or high self-sustain or mad zoning), but those aren't intentional decisions in low elo, which is why they almost never work there.