When Apple unveiled the iPhone 4S in October 2011, the announcement disappointed many observers who had expected a radical design overhaul — the device looked identical to its predecessor. But a closer examination of the specifications revealed a device that was, under the hood, a significant generational leap.

The centerpiece of the iPhone 4S was the A5 chip — the same dual-core processor Apple had introduced in the iPad 2 — combined with a dramatically improved 8-megapixel camera and, most consequentially, the debut of Siri, Apple's voice assistant.

Against the competition of late 2011, the iPhone 4S held up remarkably well. Samsung's Galaxy S II, then considered the gold standard of Android smartphones, offered a Super AMOLED display with more pixels than the iPhone's Retina Display, a larger screen, and the expandable storage and customization options that Android's open architecture allowed. Many Android enthusiasts pointed to the Galaxy's larger form factor as a decisive advantage.

The HTC Sensation XE and Motorola RAZR were also significant competitors, each offering features the iPhone lacked — including NFC technology, larger batteries, and the broader app ecosystem diversity that came with Android's openness.

Where Apple's device consistently excelled in comparative reviews was in software-hardware integration, camera performance per megapixel, benchmark performance despite matching or lower clock speeds than Android rivals, and — most importantly — the overall user experience cohesion that came from a single company controlling every layer of the product.

Siri, imperfect as its initial iteration was, represented a qualitative difference in how users interacted with their phone — not just another spec to list in a comparison chart.

The spec sheet comparison, in other words, never fully captured why people bought iPhones. It still doesn't.