There could be reasons though. Maybe assholes like Microsoft introduced stuff like secure boot or crypto certs for the firmware to obstruct adoption of open standards and customisations. Maybe the tech is very difficult to master and people doesn't generally have much tIme to learn it. Maybe widespread usage of AI makes the type of security we know today obsolete, as they can find and exploit vulnerabilities in realtime. I dont know, just playing devil's advocate, and if it was any of these reasons it would be nice if they were at least alluded to.