Originally Posted by wogoga
Still wrong. Thermal emission applies even to systems with discrete energy levels. It does not produce a blackbody spectrum in such a case, but that's irrelevant.
But no matter. The point, which eludes you, is that stimulated emission (which produces coherence in lasers) is essentially irrelevant for thermal emissions. Thermal emission is always, always
, dominated by spontaneous emission, which is why it's always incoherent.