In production environments all extensions and customisation should be a) fully tested before deployment, and b) done with the acknowledgement of the process owners/decision makers in the business

Having promoted extensions advertised every time a user searches for anything takes up space on the tell me function that could show more relevant results from their search

We would imagine in the vast majority of cases the search is more relevant for the vast majority of users to find something they want to do (process, report on) in their production environment.

If they want to search for apps instead then maybe a link, or they can use the extension marketplace screen (in a sandbox to begin with) or they can use appsource to search - we don't see a good business case in production environments for showing extensions when a user searches for anything, and everything.