How Come Truss Rod Adjustment Fixed My Tuning Stability?

Sorry for the newb question, but I own a Majesty Monarchy. I recently changed the strings myself (I used the same exact Slinky 10’s that have always been on it), and when I was finished, the action was higher, the strings horribly tight and the guitar would go out of tune if I looked at it wrong.

So I did a quick, extremely small clockwise truss adjustment, and the action was butter! Low, and no string buzz. I didn’t think it’d be that quick and easy.

The thing that I didn’t expect, though, is that the guitar now stays in tune extremely well, like it did when I first bought it.

I am wondering if I somehow got “lucky”, or if a truss adjustment can indeed fix tuning stability issues.

Thanks!