The question that has been brought up with the Touchbacks is, Why are you penalizing the team that just scored ?
What do you mean? It's to incentivize returns and disincentivize touchbacks. If a kicker drops the ball between the receiving team's 20 yard line and the goal line it's a live ball and has to be returned. If they kick it out of the end zone then it goes out to the 35. Conceding field position at the 35 because you can't cover or kick is just an indictment of your special teams, not a penalty for the team that just scored.
If your special teams unit typically stops returns at the 35/40 then they can keep blasting it out of the end zone.