Slappies should die out as "cool". Hear me out....They are difficult for people who are used to ollies, so are any differently leveraged trick (pressure flips, primo stands, whatever).
I don't care if someone does any trick but stop marketing it as the cool thing to do when you hit 40, or worse, the cool thing to do while you're young and don't have a hip impingement stopping you from ollies. Small ledge tricks are already low impact enough for anyone under 70. Don't sell yourself short.
If it's not good enough for a video game trick it's not good enough for any serious skateboarder. Become a filmer and do something productive if you're that fried.