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Don't get all wrapped up in charts, graphs and numbers. They can be deceiving, unless you look up the actual test parameters. It's not as simple as drawing a line across the chart. It's a lot more complicated than that.
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It's always amazing to me how someone can quickly dismiss science by declaring "it's a lot more complicated than that." Here's an admittedly unscientific experiment conducted by a father and his sons that clearly shows 5W-40
oil is significantly thicker at 0 degrees celsius than it is when it's approximately 100 degrees celsius.
https://www.youtube.com/watch?v=8cyzRwlzHRc
https://www.youtube.com/watch?v=21iYS-vaCQU
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A multi-weight oil is designed for a specific purpose. The "5W" part is thin, so it flows easily when it's cold. The "40" part is a bit thicker, so it supports the bearings, rollers, and such when the engine is hot. It's not logical for it to be the other way around. You wouldn't want something that's molasses when cold, and baby oil when hot.
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The fact that 5W oil is thicker when cold than 40 is when hot may not be desirable but it is fact.