Take a look at the improvements or changes in the new bios release. If there's nothing you need, then there's no reason to upgrade. As for bios flashed bricking a system - yes, it can happen. But if the correct flash procedure is followed and the system isn't interfered with during the process, the chances of encountering a problem are, in my experience, virtually nil.
Thank you for saying what you've said.
There was a time, and it was a very long time ago, that I looked upon BIOS upgrades as something to be done only as a last resort because it was, compared to now, relatively easy to "brick your machine" while doing one. Those days are long gone.
If you download BIOS upgrades from your computer's manufacturer they are typically packaged these days like any other upgrade: you download the program, run it, and [in the case of BIOS/UEFI] reboot afterward. Just follow the directions, which are generally quite simple.
It's fine if folks don't want to do these upgrades because the issues identified may have no significance to them. I, on the other hand, I view these updates as being just as essential as keeping other system components up to date. Opinions on this differ, quite a bit, but that's mine and I always recommend that if you know a BIOS/UEFI update has been issued for your machine that it be applied as a matter of course just like other updates are.
Brian AKA Bri the Tech Guy (website address in my profile) Windows 10 Home, 64-bit, Version 1703, Build 15063
A man's worst difficulties begin when he is able to do as he likes.
~ Thomas H. Huxley (1876)