nospam wrote:

for that, you need the passcode, which if it's complex, will take a few
billion years to crack, and the imei won't help you at all,

Your entire belief system is built upon a house of cards fed to you by
Brand X marketing, admittedly one of the best marketing organizations in
the world, such that you actually seem to think that an adversary must go
frontal on your strongest link in order to obtain what they want.

As just /one/ example of how adversaries attack weak links first, read any
of the hits from this simple directed search:
https://duckduckgo.com/?q=crack+encr...ing+cpu+sounds

To save you time, this is the first hit:
https://www.extremetech.com/extreme/...-computers-cpu

The point here is that the mobile device security is only as strong as the
set of weakest links, which are the same for all consumer grade mobile
devices.