Didn’t the category template for Support do exactly the same? It’s also adding text to the body. Isn’t that the reason why there is a watched word that made it more difficult for me to post the OP containing the template? When you create a new topic in Marketplace the body is also filled with text. So I had the impression the body text was part of the link to ensure the template was visible in this case too.
I still think it makes sense to have the same result in the body if you’re using the new topic button and if you’re clicking one of the buttons on an official theme or plugin.
In general it would probably be easier if these buttons manually entered into all the official topics were created automatically. Then mistakes in the tags couldn’t happen and they could be updated way easier. But that’s probably difficult because they don’t all work the same. Data explorer suggests to ask in Data & reporting, the sso plugins tell you to ask for help in SSO instead of Support.
Customizing the placeholder instead of the body per category was possible with Topic Template Placeholder Text theme component.