[nequo]

But this is Linux so you can use a different distribution if your current distro is daft like that.

Or do you mean that certain programs (like one mentioned by sibling) require the switch to be on?

[mort96]

Yeah, that's one of the ways these "optional" "security measures" often become non-optional. Android is a prime example of a system where this has already happened: sure, you can root your device (if your manufacturer allows you to), but none of the software you need.

Another way is simply for the manufacturer to lock down the bootloader/BIOS and not let you disable "secure" boot, as is also common in the Android world.