I think it depends on the situation. Some questions really are better off on Stack Overflow where there's tech specific communities that watch tags and answer questions. Simple HTML, CSS, JS, and PHP questions belong over there and closing as such I makes sense and, I think, is thoroughly explained in the closed question flag.
That being said there are many edge-cases in which there are simply better places to get answers, most of these edge-cases are 3rd party plugins. Maybe we can collect some predefined responses to types of questions here that may be easily copy and pasted into questions as they are closed/voted.
General 3rd Party
Welcome to the WordPress StackExchange! Unfortunately, questions exclusively regarding 3rd party plugins are [considered to be off-topic](https://wordpress.stackexchange.com/help/on-topic/) and better asked using their respective support methods. Please [take the tour](http://wordpress.stackexchange.com/tour/) and visit our [help center](http://wordpress.stackexchange.com/help/) to learn more. A better place to ask this type of question may be [The Official WordPress Forums](https://wordpress.org/support/forums/) or the plugin-specific support.
In the above reply it may be beneficial to switch out the WordPress Forums link with the 3rd party specific WordPress Support Forums link.
For WooCommerce specific questions I also like to leave the following reply to point the user in a helpful direction:
Some alternative options: The [WooCommerce Slack Community](https://woocommerce.com/community-slack/) is very helpful for support. The [WooCommerce plugin support forums](https://wordpress.org/support/plugin/woocommerce/) can also be very helpful. If you're looking to hire help we suggest checking out the [WooCommerce Customizations](https://woocommerce.com/customizations/) section. Good luck!
We could list all 3rd party plugins here but modifying the above is usually a good starting point or boilerplate. One to keep in mind is to not link to any unofficial sources.