The other aspect to consider is changing requirements. Maybe a device capable of transmitting PSTN-level audio quality wirelessly would have been popular twenty years ago, but nowadays most people wouldn't settle for anything with less than 44.1kHz bandwidth. A faster processor means that there's some room for software upgrades later on, future-proofing the device and potentially reducing electronic waste. Unfortunately, that advantage is almost always squandered in practice by planned obsolescence and an industry obsession with locked-down, proprietary firmware.