This is the type of "PC architecture" cruft many customers have been yearning to ditch for years.
Personally, I have always been annoyed that the BIOS is clunky and every change requires a reboot, taking several minutes. As computers got faster over the years, this has gotten worse, not better. At the core of cloud economics is elasticity: don't pay for a service that you don't use. Wouldn't it be great to power down an idle server, knowing that it can be switched on seconds before you actually need it?
If you want more insight into all of the things that normally run on "PC architecture" - the 2.5 other kernels/operating systems running underneath the one you think you're running - https://www.youtube.com/watch?v=mUTx61t443A
The BMC is often a huge problem, its a shifty architecture and extremely unsafe. Meta is paying for u-bmc development to have something a bit better.
Doing things like rack attestation of a whole racks worth of firmware if stacked PC is incredibly hard and so many companies simply don't do it. And doing it with the switch as well is even harder.
Sometimes the firmware runs during operations and takes over your computer causing strange bugs, see SMM. If there is a bug anywhere in that stack, there are 10 layers of closed source vendors that don't care about you.
Costumers don't care if its PC or not, but they do care if the machine is stable, the firmware is bug free and the computer is safe and not infected by viruses. Not being a PC enables that.
I imagine they are aware that this isn't a solution for many customers. A John Deere tractor makes a poor minivan. This isn't for you. That's fine. It's not for me either. That's ok. I don't need to poo-poo their efforts and sit and moan about how it's not for me.
