There must have been some groundswell movement amongst users all demanding that the boot process be made more "secure". There must have been well-publicised cases where "bad guys" were hijacking the boot process.
Perhaps different people have different definitions of "secure". If some third party, including the seller, has control over access to the computer or what I can run or disable on it after I purchase it, then I do not consider that computer to be more "secure". I just consider it to be less useful and less trustworthy to use with any personal data.