Like all mechanical things, there are variations between individual engines of the same type. Add in 0W-water thin oil and even the most minor of imperfections can lead to oil consumption. While the Toyota engines are known to be of very high quality, it would not be surprising to find that a more conventional viscosity solved and/or prevented the problem.
Honda/Acura had and still has a rash of oil consumption issues. Mostly due to the low tension piston rings, failing to seal after far less than 0.001 inches of wear. That's right! A wear number so low, it's measured with 4 significant digits. It's interesting to note that the components removed from those Honda engines often still meet new specifications. Replacement with upgraded parts (read more conventional) solves the problem and the engines go on to live for the typical and expected long lifespan.
What we are seeing are, to some extent, oil related failures. We can successfully use low tension piston rings in bores with tight tolerance control (high quality). But add in wild temperature swings, ultra thin oils, cylinder deactivation, and long oil change intervals and the ability of a thin, low tension ring to seal can be compromised. This should come as no surprise.
In much the same way that it's no surprise that timing chains stretch (wear) much more quickly when engines are operated with thin oils, contaminated with soot and fuel for extended drain intervals.