There is actually a lot of truth in what you are saying. One of the most important improvements MKX made over MK9 is the input timing and responsiveness. In MK9 inputs were somewhat stiff and unresponsive which made execution overly hard, plus there were some moves for which the timing was extremely strict, such as after Raiden's Shocker. By contrast, inputs in MKX feel smooth and responsive, i.e. as soon as I press a direction or a button my character just moves exactly as I expect them to, and that creates a positive feedback loop in the player's mind and they feel a little sense of satisfaction each time that happens, which ultimately results in a more enjoyable gameplay experience. In addition, during a match we can now focus on strategizing as opposed to fighting with the controls.
So in a sense, MKX is less execution heavy, but still challenging enough to where you have to actually spend quite a bit of time practicing in order to get good at it.
