re: Is 0w20 really what is best for our vehicles?

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But jumping up several oil viscosities on an engine designed with lower viscosities in mind will likely increase wear vs decreasing wear.

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Not true, some engines, especially those with cam phasers that rely on oil pressure, are seeing routine failures due to using OEM spec'd oil. As the engines wear and tolerances open there is not enough volume from the oil pump to keep the required pressures where they need to be in operation. BMW, MB, Ford, GM all have engines with known failures related to oils they recommend in the US but not elsewhere. Part of why you are seeing more recommendations or requirements 5W50, 10W60, etc. There's not a factory engine out there that has tolerances so tight a 10W30 or even a 15W40 would hurt, OEM's spouted that nonsense to explain away the CAFE oils.