This is generally going to be outdated advice for computers and phones that have SSDs leveraging built-in full disk encryption and cryptographic erasure. Since

This is generally going to be outdated advice for computers and phones that have SSDs leveraging built-in full disk encryption and cryptographic erasure. Since OP brought up Apple products, that will include anyone using FileVault, and it even includes people not turning on FileVault on all Macs leveraging the T2 chip or Apple Silicon – Apple is forcing full-disk encryption even if you're not enabling FileVault. For iOS devices this automatic full-disk encryption has been happening for many years now, implemented much earlier than Intel Mac systems gained the capability. I think the iPhone 4 was the first iPhone to get full-disk encryption, which on iOS has always been on by default and cannot be disabled. If your Mac system is on this list or newer then it's already protecting your storage: https://en.wikipedia.org/wiki/Apple_T2#Products_that_include_the_Apple_T2 https://en.wikipedia.org/wiki/Apple_T2#Products_that_include...