At launch of Civic X in US, Honda sensing was a $1000 option , means vehicle equipped with it were $1000 more in price . Later it became standard all across the model line and $1000 price was dropped.
Civic XI comes standard with Honda sensing in US. Pricing wise in US, Civic XI is not much expensive than Civic X.. keep in mind Civic XI also added many other features which were not in Civic X. Like a 7" headunit with apple and google integration was not there in base model Civic X. There are many other small little improvements across the model lineup. Civic XI also has rear side airbags on USDM as standard, first in class.
PKDM Civic going above 5.5 Million just because it has Honda sending does not make sense..