100% of Civic Si's and Type R's are manual, but there are relatively few of them and there will be even fewer Integras. Sales of all three of these models combined will be less than sales of the Ridgeline. Even if the take rate for a manual in an Integra was 100% instead of 65%, that's still relatively few manuals sold. These are very niche-market vehicles. Most Miata's are manuals, too, but that model's volume is incredibly low compared to Mazda's total sales.
TL;DR: The Integra's unexpectedly high take rate for a manual transmission isn't very significant.
As much as I love to
occasionally drive a vehicle with a manual transmission, I do
not want another one as a daily driver. At least for me, the fun eventually wears off and it becomes an inconvenience.