@Matteo When a connector is running it is marked as active and unused connectors are tagged as Inactive and are removed after 10 days of Inactivity. So, you don't have to manually delete an unused connectors. However, if you want to uninstall a connector then you need to uninstall both Connector Service and Updater service from the server and restart the computer to fully remove the service.
You can provide this as a feedback at Uservoice for product team's review.
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