BIOS updates these days are not the voodoo they used to be.
And haven't been for a very, very long time. They can be and should be treated as a standard maintenance item. If your system happens to have an update manager that you trigger in Windows, like any other program, it's almost impossible to screw up absent a power outage mid-flash. Run updater, restart system, flash occurs as part of restart, and away you go.
Even for those that still require you to use the more old-school UEFI/BIOS interface itself to update BIOS, it's a simple and well defined series of steps that, when followed, simply work.
Bricked machines are exceedingly rare except in cases of really gross operator error when using the old-school interface or if the flash is interrupted. As you've noted, it's now very common to be able to "unbrick" a computer bricked by an interrupted flash process, too.
To paraphrase Twain, "Reports of bricked machines due to BIOS/UEFI updates have been greatly exaggerated."
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
. . . the presumption of innocence, while essential in the legal realm, does not mean the elimination of common sense outside it. The willing suspension of disbelief has its limits, or should.
~ Ruth Marcus, November 10, 2017, in Washington Post article, Bannon is right: It’s no coincidence The Post broke the Moore story