N haplogroup in FamilytreeDna

All YDNA haplogroups can be found in FamilytreeDna's distribution maps. The results are based on the results of their customers and the ancestry information they provide. The global coverage of the samples is affected by customer activity in different regions and countries, where there is great variation. In Western Europe, the coverage is good, but e.g. finding out the prehistoric origin of Finnish samples belonging to the N group is hampered by the lack of samples from Eastern Europe and Asia on FamilytreeDna's maps. In addition, it would seem that FamilytreeDna's knowledge of the historical structure of the N-haplogroup is incomplete, which fact is reflected in the classification of the samples into different levels of the haplotree. Due to these shortcomings and illogicalities I don't see it as possible to draw similar conclusions about the course of prehistory as I did with Finnish haplogroup I.  Please give feedback directly to FamilytreeDna, as these maps, if logical, would be very useful.

Y5005

CTS6496

Z1941

VL62

CTS8565

Z1936

VL29

CTS9976

L1025

L550

CTS6496+CTS7189