Comment Non-issue (Score 1) 294
The first "horror story" is specifically regarding flashing BIOS from Linux via USB. I don't understand how this is related to modern motherboards - in fact, I see it as an issue that is disappearing. This is a situation I have had on OLDER, pre-UEFI motherboards - the requirement to run an EXE from an installed version of Windows, rather than from a boot floppy that didn't care what OS was installed. Many (including my Asrock) modern mobos can update right from the UEFI system without even spinning up the boot drive.
The second is specific to power management on laptops (I will admit to tl;dr speed-reading here), which is clearly not what the OP is talking about.
Tempest in a teacup. The ONLY thing that doesn't work so well with my dual boot system with my July 2014 Asrock motherboard is enabling the accelerated boot system which just makes plain sense, as it relies on caching a booted state to disk to skip a lot of init. I was at first nervous about UEFI, having read a ton of FUD a couple of years back, but it really is a non-issue. If anything, I like the low-level system management on my Asrock better than the old Award/Phoenix dominated BIOS systems.