Tarptent only uses one CF section only not a pole in any of the shelters,
Those CF sections are used for the Pitch Lock corner (Scarps/Hogback/Moment/Notch) and the cross apex section of the Rainbow/Double Rainbow.
In one of my videos you can see me leaning with my full weight (only about 150lbs) on a Scarp Pitch Lock corner just to demonstrate that it can hold the weight with one stake.
However up to recently the weak point of CF poles has been coping with lateral pressure so with excessive bending (tight radious) they were prone to shattering.
On the on the other hand they handle vertical pressure very well.
If you are familiar with BPL you will know that Roger Caffin uses straight sections with his tents because in his experience the traditional CF poles (originally made by Easton as arrow shafts) perform best lie that.
And that is why his tents look like this :

In the last few years Easton has become interested in selling tents so it has have changed manufacturing techniques resulting in CF poles that can stand some bending.
That I know it Easton has two types one of witch is used in their tents.
Note that "5 season" (expedition) tents don't use CF still.
So you do need to know exactly what type of CF pole you buy.