Why the user root doesn't have "w" permission of its home directory?

I'm on Oracle Linux 7.6. The user root apparently has write permission for its own home directory /root. But why the mode bits of /root shows dr-xr-x---. instead of drwxr-x---.? root:[~]# cat /etc/*release* Oracle Linux Server release 7.6 NAME="Oracle Linux Server" VERSION="7.6" ID="ol" VARIANT="Server" VARIANT_ID="server" VERSION_ID="7.6" PRETTY_NAME="Oracle Linux Server 7.6" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:oracle:linux:7:6:server" HOME_URL="https://linux.oracle.com/ " BUG_REPORT_URL="https://bugzilla.oracle.com/ " ORACLE_BUGZILLA_PRODUCT="Oracle Linux 7" ORACLE_BUGZILLA_PRODUCT_VERSION=7.6 ORACLE_SUPPORT_PRODUCT="Oracle Linux" ORACLE_SUPPORT_PRODUCT_VERSION=7.6 Red Hat Enterprise Linux Server release 7.6 (Maipo) Oracle Linux Server release 7.6 cpe:/o:oracle:linux:7:6:server root:[~]# root:[~]# pwd /root root:[~]# ls -lad . dr-xr-x---. 9 root root 4096 Aug 16 21:37 . root:[~]# root:[~]# cd / root:[/]# root:[/]# root:[/]# getfacl root # file: root # owner: root # group: root user::r-x group::r-x other::--x root:[/]#