Much of the LM was written before this policy was instated,
so other forms tend to be used there, like @subsubheading
and others which just use a @address@hidden one line
paragraph, and as the LM hasn't yet been revised these
non-standard formats are still there.
In terms of the ToC presentation, I like the way the LM looks
(knowing that it's different from the NR), with the exception of
3.3.4.
The specific problem with the examples quoted in LM 3.3.4 is that they
use @unnumberedsubsubsec without an accompanying
@menu entry and @node, so they are formatted differently
in the ToC.
IMO, the problem is that 3.3.4 uses a fourth level of subdivision.
I would rather see the two "Setting..." subdivisions turned into
@subsubheading instead.
Remember that if we have
x.y.z
x.y.z.a
x.y.z.b
then some people will assume that x.y.z contains nothing useful,
especially in info or html. That's why I'm so hard on "don't put
any real info in the chapter heading, the section heading, or the
subsection heading" in the NR.