I am not a luthier but I have owned several guitars and adjusted the action on most of them. And studied a bit of math and physics.
Lowering the strings should lower the tension on the neck and the bridge.
Let's do a thought experiment. A drawing might help. Assume that the string tension stays the same.
Because the differences of lowering the saddle are so small, let's do the opposite. Make the saddle higher and imajine what happens.
Let's imagine or draw a higher saddle and see what happens. If you put on a higher saddle, let's say 6 inches, if it helps you to visualize it. We are keeping the string tension the same, so the actual tension on the neck (at the nut) does not change. However, the angle and thus the leverage effect pulling (bending) on the neck does increase. Also the stress on the neck to body joint increases. And also, the leverage effect on the bridge increases. And the stress on the sound board (guitar top) increases.
So, by doing the opposite (lowering the saddle), you are lowering the stress on the neck, the neck joint (at the body), the bridge, and the sound board.
Lowering the saddle a few mm will:
1. Make the guitar easier to play. Also easier for the strings to buzz on the frets.
2. Compensates a bit for the higher tension strings. But not noticeable or necessary.
3. Changes the intonation, more so the higher the fret. But should not be noticable.
4. Lowers the tension on the bridge and thus the sound board. Which will change the characteristics of the guitar sound. Which may be positive or negative. But probably not noticeable to most people.