IMO the refs these days are taking the "Ball to hand" argument too literally. It wasn't like this 10-20 years ago, when most handballs in the area would result in a penalty. I think the logical solution is somewhere inbwteen:
1. If a player has his arms stretched like in that Lazio game, that would be a foul/penalty whether its deliberate or not. Defenders need to put their arms behind them when defending.
2. If a hand blocks a shot on the goal, that needs to be a penalty as well even if its not deliberate. It may seem unfair to the defender (like the Inter penalty appeal against Juve) but it did stop what could have been a goal.
IMO whether the handball is deliberate or not should determine whether the defender gets a yellow/red card or not. The penalty decision should be more based on whether the hand stopped a goal, even if it was not deliberate.