I suspect there ARE more runs scored if the ball is hit harder, over the course of a season. That probably doesn't help much in certain situations though, in game X, inning X, when you really need 1 run, when contact is imperative, when even advancing a runner can make a difference between winning & losing.
To me, it's the same attitude that will lead to (probably) outlawing shifts next season. I feel in many ways, the propensity to bow down before analytics, total runs scored over a season, exit velo, launch angle, etc has many thinking those things are directly related to winning when in so very many cases they aren't.
I'll give the players of decades ago one big edge over those of today: they understood what it took to WIN, given that day, the pitcher, the score, inning, etc. Many today IMO don't. And to me, that's everything w/regards to watchability. And you're right, the toothpaste is gone. Which is a bad thing not regarding analytics itself, but for the attitude it's created.