Primacy, pay less now or more later unlearning bad habits.
Primacy does not mean demonstrating the "finished product" at the first lesson.
Building blocks of skill and knowledge, going from simple to complex, acquiring simple skills and laying a firm foundation before moving on to the more complex is how to arrive at the "finished product" or PTS maneuver that you are trying to teach.
Each little control movement that is being taught along the way should be taught correctly; this is Primacy. Good preflights, looking before turning, rudder and aileron together, etc.
The landing is the most complex of all, and yeah, most of us had it crammed down our throat- hours and hours of touch and gos using full flaps mostly and trying to learn the whole traffic pattern with the "normal routine' right from the start...but that don't make it right.
A no flap landing is at the bottom of a long power off glide. Start with a long power off glide. Of course, the student is proficient at power off glides, getting it trimmed and feeling the controls at that speed, hearing the wind at that speed, etc.
In a long power off glide, he gets comfortable and is able to focus on the point when he begins the initial back pressure, and the float is much longer, allowing for more time to see the runway alignment and depth percerption to adjust the elevator back pressure to level off just right.
The whole landing sequence is slowed down a little and is a very effective way to teach in a simulator; slowing things down to the student's speed of perception.
Of course the student is aware that this is a teaching process, and not a normal landing procedure.
As he/she gains aircraft control, flaps are introduced, a little at the time, until normal landings with full flaps are normal.
Everyone is happy and the student has averted a lot of frustration, learned to land in shorter time, and ...is actually aware that flaps are a tool that can be used by his/her judgement.