Just because of your opinion "is quite flexible". Every cable is "quite flexible", even a thick power cable.
In a patch cable, a single core really only consists of a single solid copper wire. In a patch cable, however, one core consists of -->flexible<-- stranded wire. This is "quite" a difference in terms of flexibility. Installation cables made of solid wire are more susceptible to cable breakage due to multiple bending and crushing.
https://de.wikipedia.org/wiki... Engineering)
https://de.wikipedia.org/wiki...https://de.flukenetworks.com/blog...How "flexible" a cable is is precisely defined by the manufacturers. Particularly for installation cables, there is a specification about the minimum bending radius. This is 30mm for this cable. Data sheet for the cable
https://itinfra.datwyler.com/wp-content...You cannot use "normal" RJ45 plugs for pressing/crimping for installation cables. The individual solid wires are thicker than those made of stranded wire and it is not possible to press the crimp contact cleanly into a solid conductor with good contact. Special plugs that are available for installation cables, e.g. as "field-terminable plugs", are larger than comparable patch cable plugs.