I'm on record saying a lot of DSC's writing is lacking and just plain lazy retconning just to make the show more "hip" and exciting, I just think the ENT examples are easy to explain what with the minefield incident happening 114 years before the TOS episode and Starfleet's penchant for being very nervous about previously unseen and potentially dangerous alien technology. That's why we don't hear about the Borg between "Regeneration(ENT)" and "Q Who?(TNG)" and even the El-Aurian refugees in GEN don't openly mention the Borg during their scenes aboard the Enterprise-B.