It takes time to develop the use of intent. But when you get there the quality of your Tai Chi form play will be markedly different.
Below is an example of a student who has learned for a few years.
The focus is more intense as if you are engrossed in a world of your own. Old masters say that one is so concentrated that even if a mountain collapses right in front of you your concentration will not waver.
Below is video of a student who has learned for three lessons.
Though the performance is quite good after 3 lessons the quality of the movement is not as fine. If you look carefully you can see that the iterative change is less perceptible in the first video as compared to the second.
The blurring of the perceptible changes is a step towards internalizing outer movements and allows one to bring forth the intent clearly.