In a notable reversal of automotive interior trends, Mercedes-Benz is reintroducing physical buttons and controls after data from its software-defined vehicles (SDVs) revealed significant driver preference for tactile interfaces. The company’s software chief, Magnus Östberg, confirmed to Autocar that physical rockers, rollers, and buttons will become standard in future models—starting with the new GLC and CLA Shooting Brake EVs—and will even be retrofitted to existing vehicles like the CLA saloon later this year.

Article illustration 1

The Data-Driven U-Turn

Östberg emphasized that telemetry from Mercedes' connected vehicles provided undeniable evidence: "The data shows us physical buttons are better for high-frequency tasks," particularly for critical functions like climate control or audio adjustments. This finding challenges the industry-wide shift toward minimalist, all-touchscreen dashboards. Interestingly, the data also revealed regional divides—European drivers heavily favor physical controls, while Asian markets prefer touch and voice interfaces.

Hybrid Approach to Cabin Design

The reintroduction of controls focuses initially on a redesigned steering wheel, chosen as the most efficient retrofit solution. Östberg noted the strategy balances digital innovation with practicality: "Having that balance between physical buttons and touch is extremely important." Future models, especially SUVs, may incorporate additional physical controls elsewhere, leveraging their larger cabins' packaging flexibility.

Screens, Software, and AI’s Role

Despite the button resurgence, Mercedes isn’t abandoning its tech ambitions. The new GLC features the colossal 39.1-inch MBUX Hyperscreen—the largest display in any production car. Design chief Gordon Wagener hinted this approaches the practical limit for screen size, shifting focus toward software refinement: "How can we give [the cabin] more luxury appeal? It’s the software that feels more premium." Meanwhile, AI-powered voice controls are gaining traction, with usage tripling in the CLA, driven partly by demand in China.

Why This Matters for Tech

This pivot underscores critical lessons for UX designers:
1. Ergonomic Realism: Tactile feedback reduces cognitive load during driving—a safety imperative.
2. Data Over Dogma: Real-world usage analytics can challenge industry trends.
3. Regional Nuance: Global products require adaptable interfaces.

Mercedes’ reversal signals a maturation of the software-defined vehicle era—where data doesn’t just enable flashy features but corrects course when digital ideals clash with human needs.

Source: Autocar