Because the result would be the same or even worse because you will be able to choose some other trait instead of heavy handed. Plus all heavy handed builds probably already have unarmed at 180%, because of Bonus Hth Attacks perk (-1AP to hit) and if u take rock in hand it takes you only 1AP to knock your opponent down. So you see, you would have to miss your opponent 4 times in a row to give him chance to run away, and you will probably not miss because of high unarmed skill. So I don't thinks its all that good for the game. I believe HH should at least be halved (50% knockdown chance with ST 10).
98 players online, 50% dual logs and proxies looking for bps, piece of shit game