But that's a fact about the N5, not the N5X/6P. I mean, what would you want from a new phone that would show up on a spec sheet?
Faster? Check, both of these are. The 808/810 aren't gigantic generational leaps over the 800, but they're significantly faster + 64-bit.
Better screen? They're both bigger; >1080p resolution seems irrelevant on a 5"-ish screen (though obviously welcome on larger screens where 1080p would be under 400 dpi).
More storage? Well, the 6P gives that to you, though the 5X doesn't.
USB Type-C and faster charging? Check.
Better camera? Check.
Bigger battery? Check (2300 mAh for N5, 2700 mAh for 5X).
More RAM? Check on the 6P, the same on the 5X.
Plus the fingerprint thing is probably a bigger deal than you think. Loss of wireless charging is definitely a minus, though.
So that's one downgrade, two specs that haven't changed on the 5X, and six that have; eight of those specs are better on the 6P. That's not a small upgrade, it's just that you have no reason to bother with an upgrade.