The gearing mention in the article / blog you linked is just wrong. The gearing top speed, I guarantee you, will not be 155 km/h while 4th is 150 km/h. That is just nonsense. Overdrive gears work perfectly well in Automation, I regularly build cars like that where they reach their top speed in the second to last gear.
Overall I find this whole discussion to be mostly centered around general misunderstandings.
Like @stm316 pointed out, when you get it there are very few gearings that you cannot reproduce to very good accuracy.
The only thing you need is the gearing length in speed of the top gear (not its ratio, and not the car’s actual top speed), then set that on the top speed slider and then adjust first or second gear top speed by only touching the spacing slider.
I challenge you to find any “normal” gearbox car that cannot closely be built with that system. IMO there is no need to change a system that works REALLY well despite its simplicity. If you have proof to the contrary, I can be convinced and open for a discussion, otherwise you are beating a horse that is so dead there are only bones left to beat