I admit that other makes allow more customization and there's regional differences too (Mazda USA offers far less customization than Mazda Japan or Europe specifically because their research determined us Yanks like less choices).
But I think your example is way off. You're showing Trim Levels which are equivalent to prepackaged options list like CPU, memory, Red type cover vs Blue type cover, black stylus vs silver stylus. It's still the same model (Mazda6), still the same chassis, same body, same car! And cars are far more complicated than laptops! Buying a car in the USA for 99% of the general public basically comes down to choosing the Model (Mazda6), choosing the trim level (Grand Touring), choosing the color, and then settling for whatever your nearest dealers have on the lot :)
In comparison, the ThinkPad T models have different chassis, different physical sizes, different weight before you even start customizing things like CPU, memory, batteries, etc. And remember we're only talking about the T series.
* Mazda 6 SE Saloon
* Mazda 6 SE-L Saloon
* Mazda 6 Sport Saloon
* Mazda 6 SE Tourer
* ...
... and then within each trim level, with or without nav
... and then within each, auto or manual transmission
... and then within each, petrol or diesel engines (sometimes several power levels)
... and then of course colours, paints and fabrics and alloy wheels and all that cosmetic stuff.
Admit it, there's more different option in a car configurator even at Mazda than in a laptop manufacturer's line-up.