Landing foot on the serve

[lkdog]

Nothing wrong with landing on the dominant foot, but the modern technique has evolved to where most people land on the non-dominant foot and then bring the rear foot around after it kicks out.

The issues with the old method as noted by others is the hips opening up too soon which can reduce spin/power etc. unless you have excellent timing.
Obviously if you can time the angular hip thrust you can still hit a great serve-it just is harder for many folks.

If the traditional method works for you and you serve well, don't change.