Interestingly, one of the reasons that so many people walk in Spring and Autumn from St. Jean is because of a lack of information.
Before I walked my first Camino I went looking for information about when the busy times were on the
Camino Frances and I found the statistics that are published by the Cathedral at Santiago de Compostela.
That shows that the peak months for completing the
Camino Frances is July and August and so I thought that I was being very clever by starting from St. Jean on the 15th May.
Of course, the joke was on me!
The 15th May 2019, the day I left, still holds a record for the number of pilgrims leaving in one day during Spring and is one of the busiest days of all time.
Listening to posts by other Spring pilgrims over the intervening years I have noticed a similar pattern.
By and large people either don't know that Spring and Autumn are peak times for St. Jean and this Eastern end of the
Camino Frances or went looking for information and because of confusion misunderstood when this Eastern end is busiest.
In addition, in general, people fail to grasp the consequences of this particular Camino being 800 klms long and as a result that different parts of this Camino can be very busy, moderately busy and not at all busy all at the same time.
Some time ago I suggested that the portion of the
Camino Frances from Sarria be called a different name.
My suggestion was that by differentiating this part of the
Camino Frances from the other parts it would immediately become obvious for people who take the time to look, that the busy time from Sarria is July and August while the busy times from St. Jean are April/May and September.
If people know before they start then they will have more realistic expectations. Those who can only start from St. Jean in Spring and Autumn will know to expect crowds and can, perhaps, adjust their behaviour to take this into account.
Those people who are more flexible with their starting times can also be aware and if they don't want crowds then they can start from St. Jean at other times of year (and if they also don't like rain then they can choose June and July).
Every time someone on this forum publishes finishing statistics from the Cathedral authorities without differentiating the differences between Sarria and St. Jean then those people are adding to the confusion of future first time pilgrims.
Once you have walked once or twice you figure this out for yourself but sometimes experienced pilgrims forget how it was to walk for the first time and then they forget how important this distinction can be.