I think I'm going play Devil's advocate for a little bit here. I'll give you a hardware designer's take on BIOS updates...
DISCLAIMER: Updating your BIOS does carry risk. If an update goes bad the board can be bricked. You update BIOS at your own risk.
BIOS contains a bunch of things including microcode patches for bugs found in silicon. Yes, the hardware has defects, what they do is use software to compensate for them. These subtle patches aren't necessarily explicitly mentioned in all release notes. If you get lucky, you get something generic like "enhanced compatibility with various memory manufacturers" or "increased compatibility with <some line of processors>". Intel Rapid Storage Technology, Management engine interface, etc. are typically updated this way, and it's usually not in the release notes.
The worst part of the generic messages is that they don't actually tell you what symptoms to look for. Some of these updates will make the controller more power efficient, others will enhance performance. Some will fix a corner case that will cause a blue screen. Honestly, short of something very obvious you may not notice the "bug". But if you've ever developed hardware/software before, you would know that many many of these little patches gets rolled up into 1 of these releases and most of them probably won't be mentioned because it's just too minor...
New BIOS also contain firmware for 3rd party chipsets that isn't always documented either (you sometimes see a "updated firmware for <controller> to <version>" in the notes). Firmware updates to Renessas/NEC USB3 controllers come to mind, the silicon for those chipsets have more or less stayed the same (only one change: 720200 to 720200a), yet the chips shipped a year later from release (still the 720200) is vastly better behaving... Some motherboard manufacturers bundled the new firmware with their BIOS updates, others didn't. But if you look at the reviews on newegg, you find certain USB3 complaints mysteriously stopped coming up, and there's no BIOS update explicitly saying "Fixed USB3 stability". These are the silent patches that I'm referring to.
Lastly, since this computer is new, if a BIOS update kills it, you have manufacturer and retail warranties/return options. And you're not dependent upon the computer yet. so while it sucks that you can't use the new system, it's not the end of the world. Updating the computer with all your data on it becomes much more risky, I become a little bit more picky once the system becomes my primary computer. Even then, I tend to update to the latest anyways...
Besides, I haven't had a BIOS update fail on me for ages now, especially not an Intel based chipset update. Just make sure you update BIOS within BIOS and not within Windows. Also, once you update BIOS, reset everything to defaults and reconfigure your settings. DO NOT load some saved configuration... Stored configs don't necessarily transfer from 1 BIOS version to another and can cause unpredictable instability.
Edit: I looked at your board, some things to note:
v2.7
- Updated VBIOS and GOP driver. (new firmware for intel integrated graphics VBIOS = video BIOS)
- Updated CPU Micro code to support new Intel CPU. (microcode patches, to know what these are you will have to dig deep in to Intel Errata reports)
- Improved Asmedia SATA device compatibility. (looks like a semi-silent update to asmedia firmware for the SATA controller, feel free to dig into Asmedia's Errata reports to figure out exactly what got fixed here...)
v2.5
- Removed 1024MB option in "Integrated Graphics Share Memory" of BIOS. (probably cosmetic)
- Adjusted CPU fan down time back to 0.3 sec. (no idea what this means...)
- Improved USB keyboard compatibility. (USB controller firmware got an update)
- Improved memory compatibility. (Memory controller firmware got an update...)
- Enhanced MFlash function. (sounds like the BIOS flashing tool got an update?)
- Improved some BIOS items can not be changed after clear CMOS (BIOS bug...)
Long story short, with very new generation of hardware, the controllers are getting more and more complex. It's nearly impossible/cost prohibitive to make perfect hardware. To compensate, silicon companies use firmware and drivers to patch microcode to work around newly discovered bugs. They spend a lot of time validating what they put out. Only when something absolutely can't be patched in firmware (BIOS) that they are forced to do a recall.
I would update BIOS before setting everything up, it's probably the convenient time to do it...