Native table(s) of corresponding extension doesn't DROP on uninstall and enable/disable/uninstall hooks are not handled

While working on uninstall for HRRecruitment I found that native table(s) like civicrm_hrvacancy in this case doesn't drop on uninstall. Although I did the necessary changes for HRRecruitment but there are other extensions like HRAbsence, HRJob etc. having the same issue. Along with this enable/disable/uninstall hooks are not handled in most of the HR Extensions.