The Alexander Technique is meant to be applied. Dependent on your stage of learning (and life circumstances) you can speed up your development with Alexander Technique 'deliberate practice'. You can think of this like the difference between practicing your instrument (deliberate practice) for the show, and actually performing the show (application).
Now you could just practice in your basement and never play a show, but then you'd never develop your ability to handle and enjoy interaction with other people and environments. On the other hand, you could play a whole bunch of shows and never practice but you simply might not give yourself enough clarity to improve on the mistakes you keep making. Thus, you ingrain bad habits and slow your progress.
What your balance should be between deliberate practice and application is something you have to determine for yourself on an ongoing basis. Typically, more deliberate practice is helpful when you get started or need to re-fresh, then application can take over. The key is to not completely either one for too long.
My balance this morning is at about 5% deliberate practice and 95% application. These days when I'm really 'On and UP' it's probably more around 10-15% deliberate practice and 85-90% in application; I shift my balance this way so that when I teach i'm definitely 'On and UP' when I work with my students.
When I've gone through big learning jumps (especially in the beginning) I was likely closer to 40-50% deliberate practice and 40-50% application; and usually I took deliberate practice too far. This was part of my learning process. But this isn’t about me, it’s about you and your process.
So what's your balance between deliberate practice and application?