Feature Request: Peace of mind when crossing borders

In another post I already proposed a solution (there), but you never gave your opinion.

Can you elaborate please ? I’m no SSD expert. Isn’t the internal SSD firmware hiding “old data” from us ?
Also, wouldn’t OPAL drives mitigate that risk, when the hidden partition is mounted ? Again, I’m no OPAL expert, I still have to try this so I’m only “thinking out loud”.