I agree with Bequimão and bvbfan that this seems to be a Systemd issue.
Concerning the mount points - well, maybe I have to clarify:
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 298,1G 0 disk
├─sda1 8:1 0 29,3G 0 part /
├─sda2 8:2 0 7,7G 0 part [SWAP]
└─sda3 8:3 0 261,1G 0 part /home
sr0 11:0 1 1024M 0 rom
A completely conservative partitioning scheme for a private user's desktop PC, nothing sophisticated: /var/log has no extra partition, and nothing is mounted in RAM. To underline:
$ cat /etc/fstab
[...]
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx / ext4 defaults,noatime 0 1
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx swap swap defaults,noatime 0 0
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx /home ext4 defaults,noatime 0 2
Nevertheless, I get those messages from time to time at shutdown.