Pressure from governments to not supply consumers with hardware that is resistant to surveillance is one reason.
AFAIK, the consumer systems that are most resistant to physical attack (and that lack spooky things like Intel's system management CPU) are game consoles. The hardening is a requirement for anti-piracy and anti-cheating, and in newer generations of consoles it's been quite successful. Recent iPhones are a distant second in terms of security architecture.
I don't have any details but without a exploit a game console will never run a single line of code that isn't signed. It makes the attack surface rather smaller than an iPhone.
AFAIK, the consumer systems that are most resistant to physical attack (and that lack spooky things like Intel's system management CPU) are game consoles. The hardening is a requirement for anti-piracy and anti-cheating, and in newer generations of consoles it's been quite successful. Recent iPhones are a distant second in terms of security architecture.