Why frequent work compounds
Soft tissue that has been shortened and guarded for months does not release in one hour. It releases a bit, holds the new length for somewhere between a few days and two weeks, and then reverts most of the way if nothing else changes.
Working weekly means each session starts from a slightly better baseline than the last, and after four or five the tissue stops fully reverting between visits. That is the whole argument for frequency and it applies only while you are actively fixing something.
Once it is fixed, weekly is maintenance on a problem you no longer have.
What actually holds it
The two or three things your therapist writes down at the end. Five minutes a day of the right movement does more between sessions than the sessions do, and the people who come weekly for six months without doing any of it are, gently, buying an hour of pleasant relief rather than a solution.
Nobody here will nag you about it. But when somebody asks why the shoulder keeps coming back, that is nearly always the answer.
When we will tell you to stop coming
Pain that has not changed after six focused sessions. Anything with numbness, tingling, or pain that radiates down a limb. Anything that is worse at night than during the day. Any of those want a physiotherapist or a doctor, and a therapist who keeps rebooking you through them is doing you real harm by delay.
That conversation happens here perhaps a dozen times a year and it costs us the bookings. It is the correct trade.