Note that the argument comes from the same group of people
who pushed for mounting tmpfs on /run and /tmp.
My machine:
# df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 3.9G 4.5M 3.9G 1% /run
tmpfs 3.9G 4.9M 3.9G 1% /tmp
10 megs of *RAM* consumed.