There's no reason to update firmware unless it specifically fixes bugs/problems which affect you or it specifically adds compatibility/functionality you will use. Or it's the next logical step for troubleshooting problems.
If your hardware works fine then you don't really need compatibility with other hardware you aren't going to use.
MAXIMUS VIII HERO BIOS 2202
1.CPU uCode update2.Support more PCIe-1394 devices.MAXIMUS VIII HERO BIOS 3101
Improve system stabilityMAXIMUS VIII HERO BIOS 3201
- Improved CPU compatibility- Fixed wake-up function when using some PCIE devices.- Improved keyboard compatibility when “Fast Boot” enabled.- Fixed DRAM frequency read display error in OS.- Improved DRAM XMP compatibility over 4200MHz.- Fixed Plextor M.2 device issue.- Modified OA key function in legacy OS.MAXIMUS VIII HERO BIOS 3401
1.Improved System Performance2.Modified OA key function in legacy OS3.Fixed some PS/2 devices connection issue in win8/win10 when fast startup is enabled4.Fixed chassis fan’s behavior after wake up from S35.Fixed CPU(i3-7350K) ratio item missing issue in SW
The most compelling reasons to upflash your BIOS are "Improve System Stability" and "Improved System Performance". They're uselessly vague statements, but there are threads discussing each ROG BIOS in these forums, someone always reports if it works better or worse than before.
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