Sounds like the weight I would use if I had to pick just one weight to cover every car and light truck application on the planet. It's thick enough for diesels and high torque at low rpm turbo engines or long trips down the freeway
A big factor is being educated and driving according to the climate and oil that's in h crank case. For example, my TL is obviously spec'd for a 5w20 and I believe even back spec'd for 0w20. However, it's had either 5w30 or 5w40 in it with the occasional 0w40 and even 0w20 when I was living in a very cold area for a short time. Knowing I've got a 5w40 in it and one with a high HTHSv compared to its kinematic viscosity, I drive it accordingly during warm up. I shift manually and I have 2.5 miles of residential neighborhood to go through before hitting any highways. It rarely sees higher than 1,750rpm until the water is at full temp and the oil is near 140F. I have screwed up and accidentally pulled out in front of someone and had to punch it in which case it was business as usual. VTEC even engaged with just a mile of drive time on this oil. I don't like how hot oil pressure on the J32 (I bought the car brand new so it isn't wear related) can get down to 3-4psi on a hot summer day in stop and go traffic with a 5w20. Obviously a manufacturer can't tell us to drive it easy and keep rpms below 2 grand when cold and along with the fleet mpg penalties I can see why they seem to error on the thinner side. I just thought I would point out that if someone held a gun to your head and said pick one viscosity for all of mankind for every car out there, a slightly thicker than average grade like 5w40 could be made to work in everything while a 0w20 would not work too well in a 900ftlb diesel hauling a 5th wheel up a grade or many of the newer high power density, high torque at an extremely low rpm gas engines out today. The 5w40 could be made to work in extremely cold climates in any engine as well as hot summer track days.
I know this is somewhat subjective but I've thought of 5w40 or even 0w40 in the Redline variety with a 4.0 HTHSv in the past as THE universal oil that could work in any car. I think what is fact is there are some engines that can't use the thinner oils without damage at full sustained power but there is no engine that won't accept 5w40. It may not be ideal but it will work without damage.