Yes, that does stand to reason. In fact, my DD has been working to move toward getting a little steeper/more diagonal at impact. In practice, she gets it and can launch those low ones. She has a teammate who does that very well (might call it a ferris-wheel swing) and hits bombs off low pitches off some really good pitchers.
My guess is that if you're facing hitters who've mastered that sort of swing, staying low might not be so wise. Most hitters I see in travel ball don't get that concept and swing more 'level' and have trouble digging out low balls, especially if those that have good downward movement.
For pitch calling we use the saying "when in doubt, down and out"....it works well for most batters, and if a batter proves she hit "down and out" we make an adjustment the next time through the batting order.