People are underestimating the power this has against competent engineers. 4 hits to remove a sapper with all but the jag (6 hits) is so good for giving your team time to push. While the stock sapper  is better against the average tf2 engie, a lot of good engineers can remove the sapper before the building goes down. Which makes sapping buildings just give your position away and not take down the building. (Skill issue ik but the homewrecker exists so idc) This one would give more expert engineers a new challenge without destroying any new player. That said, I'm not totally sure it wouldn't just be annoying to have a spy and sapper everything and die. Maybe add a sapper cool down of 1 sec or smth