You may have seen this You Tube video titled - How to Fix or Repair your Corners before Grading BGS PSA. Repair your Cards with the Dr.
https://www.youtube.com/watch?v=5ipg51mjzTo&t=691s
or this one:
https://www.youtube.com/watch?v=Il5Qcu3AVYI
or this one:
https://www.youtube.com/watch?v=IYVdD6WTYYU
or this one:
https://www.youtube.com/watch?v=tKiMM8w4-Ug
There are many videos that show us how to repair damaged cards before sending them in for grading. How many of these cards are being caught by the TPG's? Probably not many. This isn't going away. It will probably get worse rather than better.