Comment Re:Poor Boeing. (Score 1) 4
You're missing that both a bleed air system AND poor maintenance are required for this problem to manifest.
Presumably the other planes with a bleed air system are getting better maintenance, so haven't been a problem. No idea how the 787's maintenance is, but since it doesn't have a bleed air system, the problem of dangerously contaminated cabin air hasn't manifested.
More specifically, this happens when engine oil or hydraulic fluid leak into the engine while bleed air is being drawn.