Are you kidding? You still have to do work, but a third party doesn't get to decide if you can boot and what image you boot.
> What is particularly worrying about this process is that it is a network-linked secure boot process where centralized external servers have the power to dictate what the device should boot.
Firstly, your quote is about iOS not macOS as far as I can tell, so the competitor here would be Android not OpenBSD.
Secondly, I interpreted your comment as “that list is long enough to make one want to switch to Linux”. I then stand by my comment that most of the suggestions on the list require at least the same amount of work on Linux. (Source: I’m a Linux user that has setup things like fscrypt, ufw, openvpn on my devices.)