<xsl:apply-templates select="*[not(self::title) or not(name()

^^^^

The above is equivalent to:

<xsl:apply-templates select="*"/>

because
 not(x) or not(y)

is always true, when x != y and of course x and y are booleans.

Oh, 2 bugs in one line! What I wanted to write was
<xsl:apply-templates select="*[not(self::title or name()='subtitle')]"/>