I don't think it is complexity more the amount of money that manufacturers wish to invest in production design and materials usage as well as testing vs what they may expect from warranty claims and reputation with end users.
Examples ? FIATs Multiair system seems fiendishly complex but reliable. All those 1980s DOHC VTEC style Hondas work for mega miles as do Toyotas of the same era - at that time the redline of the Toyota Twin Cam was an unheard of (for a compact, cheap car) 7800 RPM.
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[I]So long and thanks for all the fish.[/I]
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