/ on a FreeBSD system is generally kept small. It doesn't have softupdates on when using UFS2 since it is also the location where your kernel lives, along with rescue utilities and your main /bin. Nothing else.
The proposal as put forth is misguided (talking about Fedora's in this case) and I don't think that the system should be re-engineered just because that is the default use case these days. I remember when I first started using Linux and I created a separate, /boot, /, /usr, /home, and /tmp. Just because udev and others now fail to work correctly doesn't mean it isn't a good idea to keep those separate...
This is just going to cause more trouble, more fragmentation between unix/unix-like systems and Linux and it's various distributions.