I was working on a fix for another issue that required me to disable the router. Disabling the router triggered this error:

[Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException]
The service "templating.helper.router" has a dependency on a non-existent service "router".

templating.helper.router is defined in templating_php.xml, but I do not have php listed in the templating engines in config.yml

Do we really need to load templating_php.xml and define all those services when php templating engine is not used?