708: Primary, Tertiary, and Third Cousin

What It Covers

ATP episode 708 covers the full Apple September 2025 event, analyzing the iPhone 18 Pro and Pro Max with variable aperture cameras and A20 Pro chip, Apple Watch Series 12 with continuous heart rate monitoring, AirPods 5 with ANC, the new Apple Fold, and John Turnus's debut as Apple CEO, alongside a deep privacy critique of the Apple Watch's Siri Recap ambient recording feature.

Key Questions Answered

• •iPhone 18 Pro Thermal Design: The A20 Pro chip sits beside RAM rather than stacked on top of it, eliminating the heat sandwich problem. The vapor chamber now covers three times the surface area versus the iPhone 17 Pro, with nano-twin copper material spanning the entire display. For users who experienced severe screen dimming in direct sunlight on iPhone 14 or 15, this architecture change represents a meaningful real-world improvement in sustained outdoor usability.
• •Variable Aperture Camera Reality Check: The iPhone 18 Pro main camera supports four apertures — f/1.48, f/1.8, f/2.8, and f/4.0 — compared to the fixed f/1.78 on the 17 Pro. The wider maximum aperture genuinely improves low-light capture. However, six straight aperture blades produce non-circular bokeh shapes, and the tiny sensor means depth-of-field effects remain far shallower than equivalent f-stop numbers on full-frame cameras. Software processing will compensate for most of the optical limitations.
• •A20 Pro Chip Architecture: Built on a 2-nanometer process, the A20 Pro features a six-core CPU with two new desktop-class super cores rated 20% faster, a seven-core GPU with 40% faster graphics, and a doubled neural engine with 32 total cores delivering twice the compute power. Memory bandwidth increases 50%, and the CPU connects directly to the vapor chamber. These specs closely mirror the M6, suggesting Apple has synchronized its phone and desktop chip development cycles.
• •Apple Watch Series 12 Heart Rate Monitoring: The redesigned sensor array samples heart rate every five seconds during normal wear — roughly a 60x increase over previous intervals — and measures heart rate variability every five minutes. Apple claims this makes it the most accurate wearable heart rate sensor, validated against ECG chest straps. This continuous data stream enables a new readiness score from 0–10 and a health age metric, directly competing with Whoop and Oura Ring's core value propositions.
• •Siri Recap Privacy Architecture and Risk: Siri Recap records ambient audio in an isolated SOC exclave on the Apple Watch, encrypts it, transmits it to the iPhone via Bluetooth for on-device transcription, then sends a summarized version to Private Cloud Compute for further filtering. Summaries are retained for seven days. Despite these technical safeguards, the feature creates records of sensitive conversations — including those involving healthcare decisions or identity — accessible to anyone with device passcode access, raising serious domestic surveillance and workplace trust concerns.
• •AirPods 5 Pricing and ANC Expansion: AirPods 5 launch at $129 with active noise cancellation included — the same price as the previous generation that lacked ANC entirely. The upgraded model with wireless charging case adds on-stem volume control and improved battery life at $150, matching the prior generation's price. Apple now includes ANC across its entire AirPods lineup. The on-stem volume swipe, previously exclusive to AirPods Pro, is the primary functional differentiator between the two AirPods 5 tiers.
• •iPhone Price Increases Across the Lineup: The iPhone 18 Pro starts at $1,200 for 256GB, a $100 increase over the 17 Pro. Notably, the iPhone 16, 17, 17e, and Air all received $100 price increases simultaneously despite no hardware changes. Storage scales to 2TB on both Pro models. AppleCare One Family now covers all eligible devices for up to six people across a household, though multi-Apple-ID power users risk devices being removed from coverage when alternate accounts are detected on a device.