Using "security" in air quotes diminishes the significant effort Apple and others put into making devices secure, and this does have fundamental trade-offs for the end-user. Some of us actually care a great deal about security, and appreciate the trade-offs and effort put in to making that happen.

I sympathize with the tinkerer mindset, but this mindset exposes serious lack of empathy in exposing REAL risk to REAL people by allowing anybody to hack devices simply to satisfy 0.01% of users who want to run a custom bootloader. This is not a valid engineering trade-off for a "trillion dollar company". The world doesn't revolve around you. There are other products on the market for tinkerers that don't involve exposing everyone from your grandma to politicians to serious security and privacy breaches.