I've had the opportunity to own Mercedes models spanning four decades, from the 1990s, 2000s, 2010s, and 2020s. We can see how ergonomics, controls, and electronics have evolved. What was once a driver centric, mechanical approach to usability has now shifted toward excessive screen dependency, often at the cost of practicality and ease of use.
Mercedes from the 80s and 90s were built to last, relying on vacuum actuated controls, mechanical linkages, and minimal electronics. Electrical systems were relay controlled with simple fuse circuits, making them simple to diagnose and repair. The AC system used vacuum operated flaps, which meant fewer failures compared to the modern stepper motor based flaps. Everything had a physical button, knob, or switch ensuring that controls were within reach without distracting the driver. Cars like the W124, W201, and W126 were designed for longevity with overengineered components that could outlast multiple generations.
The 2000s saw the transition to Canbus controlled electronics, allowing modular system communication across the vehicle. The introduction of SAM modules reduced reliance on traditional relays and improved diagnostics. Despite these advancements ergonomics remained intact, with physical buttons for most functions. My X164 GL350 is a perfect example of this balance. Climate controls are straightforward with dedicated buttons in the centre console even for adjusting AC for rear passengers. Seat adjustments, lighting controls and even air suspension settings are all accessed via physical switches, providing a convenient approach.
With the 2010s came the widespread adoption of digital interfaces. The COMAND system became a central hub for vehicle functions, integrating features into a single screen. However, physical buttons were still present for essential functions like climate control, media, dynamic drive modes, and functions like rear sunshade adjustment. The NTG 4.5/5.0 systems though less intuitive, atleast retained basic controls for quick access. In my W205 C-Class, the infotainment was controlled through a rotary COMAND dial and touchpad, which is not the most user-friendly, still allowed for relatively easy operation for basic media shortcuts.
Post-2020, MBUX system has taken the touchscreen approach to an extreme, completely eliminating physical buttons in favor of digital interfaces. Introduction of capacitive buttons even for the steering wheel is a disaster! This has significantly impacted usability. Essential functions like lumbar support and seat massaging are buried under multiple menu layers, requiring several taps to access. The problem is even worse in my EQS580, where adjusting screen brightness involves navigating through multiple settings for the main display, passenger screen, instrument cluster, ambient lighting, and HUD, instead of simply using a dedicated physical knob as in previous models.
The odometer’s persistent blue backlighting is a constant source of eye fatigue, and while OLED screens are sharp, high resolution and bright, they introduce unnecessary distractions and cause fatigue during night journey.
The EQS also highlights the absurdity of excessive screen usage. It has six screens, most of which serve no real purpose. The front passenger display is redundant, as it is rarely used in real world conditions. The rear-center tablet is unnecessary given that there are already two dedicated rear seat screens. Worse still, the rear entertainment system lacks built-in streaming apps like Netflix, Youtube or Prime Video, despite BMW offering them in the i7’s cinematic display. Instead, Mercedes provides only an HDMI port inside a cubby beneath the rear AC controls. To stream content, you need to connect a third-party device like an Amazon Fire Stick, which then requires a separate remote to operate. An inconvenience that defeats the purpose of built-in entertainment.
Another example of poor usability in the EQS is the rear seat adjustment process. In previous and current S class, adjusting the front passenger seat from the rear was as simple as using a dedicated switch. In the EQS, this function has been buried in a touchscreen menu, requiring multiple steps to complete a basic task. This shift toward touchscreen dependency isn’t just an inconvenience, it actively degrades the user experience.
Luxury carmakers push for a fully digital cockpit has come at the expense of ergonomics and usability. Physical buttons were far superior, providing tactile feedback and allowing drivers to make adjustments without taking their eyes off the road. MBUX or even the iDrive menu-heavy system creates unnecessary distractions, making even the most basic functions tedious. Screen overload in new cars is more of a gimmick than a functional improvement, with multiple redundant displays adding complexity rather than convenience.
Technology should enhance the driving experience, not hinder it. In their attempt to appear cutting-edge, luxury brands are sacrificing the user-friendly nature. The solution isn’t to eliminate technology but to strike a balance bringing back essential physical controls while keeping screens for secondary functions just like Bentley and Rolls-Royce.