"Yes, there is one filesystem that comes very close to perfect.
It is ramfs.
"It is dynamically resizable and very fast. The major downside
is that there is the possibility of filling up the ramfs until
there's no memory left and, as a result, the system will hang.
Another downside is that the data in ramfs is not reboot persistent
so any data contained in a ramfs will be lost upon reboot."