I mean I understand what you're saying, but it really should balance out, I'm not understanding the problem. There's no point in comparing efficiency. Motherfukking duh efficiency will plummet in a world where you are docked for missing shots, that's exactly the point
Extrapolating current understanding of efficiency into a set that is purposely reducing said efficiency is pointless.
You act like the Tony Allen's of the league will all of a sudden become max players because better shot attempts are further rewarded. I know in football we like to say defense wins games, but not only is this not football.... You literally HAVE to score to win regardless of what you're playing so that quote is quite literally not true.
You even made my point for me by admitting 2s efficiency drop as well. That is the entire. Damn. Point. Both drop, but the 3s will suffer more because people are chuck those at rates far worse than 2s.
With the simple "addition" of -1 the market adjusts, people will shoot less 3s, overall more efficient shot making further encouraged.