Surely clicking a parent should imply the children and display the parent's products AND the children's products. But it doesn't. So what benefit is there?

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=== The above is a re-wording (and slight re-focussing) of the original question below ===

How to display child-termed products when parent term is clicked?

This question refers to Commerce Kickstart 2.2
But it may be a general Drupal question rather than Commerce specific.

I have a taxonomy for my catalogue.
It has terms and child terms -- possibly grandchild terms later.
As it is Kickstart, Taxonomy Menu is installed and working.

I have products tagged with child terms only.
When I click child terms in the catalogue menu, the products are displayed.
When I click the parent terms nothing is displayed (except a page header equal to the parent term).

I want the system to display all products tagged with child terms when the parent term in chosen.
The answer here suggests using Views, "If you've overridden the default taxonomy page with views...".

Is there an easier way to display all child content when a parent is selected?