If it's the choice between $50 worth of buttons and $100 worth of touchscreen, then $50 worth of buttons wins on cheapness.
And at that end of the market, it works (and it makes sense that it works).
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But at the other end of the market: Common luxury cars have lots of features, and KISS isn't really one of the design goals (if a customer wanted cheap and simple instead, perhaps they'd be shopping for a Dacia instead). Things are still built down to a cost, but there's a greater quantity of those things.
When the choice is between $200 worth of buttons or $100 worth of touchscreen, then $100 worth of touchscreen wins.
https://www.topgear.com/sites/default/files/cars-car/carouse...
It wasn't always like this. Mercedes-Benz used to make high quality, straightforward automobiles without all the inspector gadget james bond crap. See e.g. W123, W124, W126. Luxury meant high build quality, safety, comfort, easy maintenance, and a lifetime of reliable, dependable performance. Not features--you get the same basic features (ok, temperature regulated climate control is kind of novel for the late '70s-early '80s W123). But this stuff was minimal. Now the whole goddamn car is an iphone app. It's disgusting.
Electric power windows, vacuum-operated power locks, telescopic steering column, power-adjustable mirrors, a radio that does AM and FM...
Fancy stuff seemed pretty common on those (awesome, stout) German luxury cars.
The more I think about it and read comments here, the less sure I am that the gilded age of simple, reliable cars has ever actually existed. :)