I agree we’re long way from it; but, I don’t think the secure signing of components would necessarily equates to “no reason”, though, that’s definitely not a blanket statement. Personally I’m huge proponent for locking down components with secure signing on the portable devices — less likely to experience theft, if thieves cannot get into the device nor salvage for parts (though right now they just skim passcode and reset iCloud account to circumvent it; but this can be fixed with more security around the workflow). However, for fixed devices, it makes less sense.