Lifting the ball isn’t a new concept, and it doesn’t become one just because someone coined the phrase “launch angle.” Ted Williams recognized it as the root cause of productive hitting over three quarters of a century ago, and he probably wasn’t the first to do so.
The best strategy for running a team is “hit it in the air, but keep it on the ground.” A lot of metrics are just massive expansions of this simple principle. Now I would agree that some hitters should try to keep that launch angle under 30 degrees, and get back to the disappearing art of being a line drive hitter.
I do think a lot of metric stuff is mis-cited. For example, many think sabermetrics frown on bunting. Not true. They frown on sacrifice bunting. But if you can bunt for a base hit, that’s a different matter…