About legacy system extensions will it be supported in the future for Mac

Keep in mind that if you delete an extension, at this time, that app may no longer function. This matter concerns any remaining legacy extensions when the next OS is released. At that time, their apps will stop working. All responsible vendors are in the process of making the needed changes, so it is not likely to be anything weened to be concerned about.

Please review https://support.apple.com/en-us/HT203051 . To delete, simply select and delete.