Sub Articulo 86.0
If one inserts explicit space into
a document, one should almost always arrange for it to change properly
with font changes. In this particular example, a stop-gap solution might
be \\[-\baselineskip], since baselines are nearly always changed when
font sizes are changed (and an empty line typically takes up just one
baseline).
As a more practical, example, if one is creating a table and
desired some extra vertical space (say every fifth line to aid the eye
in scanning across a line). The amount of space shouldn't be hard coded,
but should be in terms of quantities that change roughly in proportion
to the separation of the other lines (such as \baselineskip).