Its there, never left. Same thing happens every time they add something. On one side you have people that complain that there are not enough firmware updates then others who complain and speculate, create issues from not following simple guidelines before flashing etc.
Often when something new is added you will or will not see it due to using a cached page in your browser. Other times they are arranging the website and its moving around. Still under the same Mobo but for example listed under others instead of win10.
For those complaining of boot order, boot device changes etc, this happens 100% of the time if your setting is anything other than the default values. Firwmare does not scan before you flash and carry over your settings.
First and foremost before any flash always load optimized defauts or to make it easy hit F5 before you flash you BIOS ROM. Of course if you have a raid array or anything of that nature you will have to change it back after you hit F5 as its going to be set to default which in none, Same goes for CSM and UEFI boot. Best practice is to write everything down, take pictures or whatever to make a record of your settings. Other than boot devices everything else should be at default before the flash. After the flash guess what? They are all going to be set to default so spam the F2 or delete after the BIOS flash and reset to get into the BIOS and set up your devices again.

“Two things are infinite: the universe and human stupidity, I'm not sure about the former” ~ Albert Einstein