diff --git a/libexec/rc/rc.subr b/libexec/rc/rc.subr
--- a/libexec/rc/rc.subr
+++ b/libexec/rc/rc.subr
@@ -1798,9 +1798,6 @@
 #	return value from the script.
 #	If `file' ends with `.sh' and lives in /etc/rc.d, ignore it as it's
 #	an old-style startup file.
-#	If `file' ends with `.sh' and does not live in /etc/rc.d, it's sourced
-#	into the current environment if $rc_fast_and_loose is set; otherwise
-#	it is run as a child process.
 #	If `file' appears to be a backup or scratch file, ignore it.
 #	Otherwise if it is executable run as a child process.
 #
@@ -1836,8 +1833,6 @@
 
 			if [ -n "$rc_boottrace" ]; then
 				boottrace_fn "$_file" "$_arg"
-			elif [ -n "$rc_fast_and_loose" ]; then
-				set $_arg; . $_file
 			else
 				( trap "echo Script $_file interrupted >&2 ; kill -QUIT $$" 3
 				  trap "echo Script $_file interrupted >&2 ; exit 1" 2
@@ -1909,14 +1904,8 @@
 	_file=$1
 	_arg=$2
 
-	if [ -n "$rc_fast_and_loose" ]; then
-		boottrace_sysctl "$_file start"
-		set $_arg; . $_file
-		boottrace_sysctl "$_file done"
-	else
-		_boot="${_boot}" rc_fast="${rc_fast}" autoboot="${autoboot}" \
-		    $boottrace_cmd "$_file" "$_arg"
-	fi
+	_boot="${_boot}" rc_fast="${rc_fast}" autoboot="${autoboot}" \
+	    $boottrace_cmd "$_file" "$_arg"
 }
 
 boottrace_sysctl()
diff --git a/share/man/man8/rc.subr.8 b/share/man/man8/rc.subr.8
--- a/share/man/man8/rc.subr.8
+++ b/share/man/man8/rc.subr.8
@@ -27,7 +27,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd September 22, 2024
+.Dd October 23, 2024
 .Dt RC.SUBR 8
 .Os
 .Sh NAME
@@ -1041,17 +1041,9 @@
 .Ar file
 is not executable, ignore it.
 .It
-If the
-.Xr rc.conf 5
-variable
-.Va rc_fast_and_loose
-is empty,
-source
+Source
 .Ar file
-in a sub shell,
-otherwise source
-.Ar file
-into the current shell.
+in a sub shell.
 .El
 .It Ic run_rc_scripts Oo options Oc file ...
 Call