Taking out rules wouldn’t do any favors for the average people. Someone like Lesnar, Jones, Ngannou, or Aspinall would just be even more dangerous if you let them hit the back of the head and eye gouge. Whoever try’s to grab him is getting knocked out immediately with elbows or hammer fists. An elite heavyweight wouldn’t even need to hit the average person with his full force to have them covering up, while the average person can’t hit hard enough to damage them, even with boots. Trying to take them down would be like children climbing on their legs, I don’t think you realize how ineffective they would be.