For starters, a harness bar is not safe, roll over with a harness and no roll over protection, not a good idea.

Second, a 4 point CAN ride up in the event of a wreck. There is QUITE a bit of force in a wreck.

For autocross, a drift event, things like that, a 4 point is fine, chances of wrecking are slim, and the speeds are fairly low. For the other guy, 6 point Sparcos, nice, but $$$$ lol.

If you want total specifics why it's not safe, search, I don't know every technical detail, but it is just common sense WHY it looks wrong. I've had 4 points before, nice ones, even ones wrapped around a cage. I was scared every day lol.

4 point harnesses, including your sick Takatas, are not track legal. For a reason.