The 1660 Ti is Turing, the same architectural generation as the RTX line, they've just thrown out the RT cores, for good reason.
Regardless, even 'last gen' parts are current until they've been replaced, and this hasn't been done in the low-end segments yet.
And they know they can't do this because the bulk of turings new features are dead weight in the bulk of consumer apps and lower-end Turing parts would both damage the RTX brand by not being able to do anything RTX and damage their margins by costing more than
I didn't say it was a better card than two gens back in absolute terms.
I said the 1660 Ti is better at 2019 games than the GTX 970 was at 2015 games. It's a better value now than the 970 was then. Not only is it better in absolute terms, it's better in terms of it's potency in it's segment.
Forget price for a moment and use logic
Price is what defines market segment and there is no more rational, logical way to do so.
The 1060 is firmly in the upper mainstream segment and the 1060 is current for another week because it hasn't been replaced.
They use an older architecture than Turing, which is in the entire RTX line up and the 1660 Ti, but architecture isn't what defines segment or what products are current, price and what is being sold is.
They don't. They want to replace Pascal, but they don't have anything to replace the low-end Pascal parts with and they probably won't, until 7nm.
Low end Pascal and mid to high-end Turing will likely remain contemporaneous until they are both replaced.
Turing is more than tensor and RT cores, but the TU106 (third largest consumer Turing die) and 116 (fourth largest) die flavors are generationally speaking, analogous to GP106 (third largest consumer Pascal) and GP107 (fourth), not GP104 (second). So, architecturally, they are even lower end, relative to their contemporaries.
It targets the 300 dollar segment and highly competitive in that segment. 300 dollars is not a low-end segment, it's firmly upper mainstream. It might be a low end part at some point before it's replaced, or not, but today it definitely is not.
All the generational and architectural stuff is purely academic and rightly irrelevant to the majority of consumers. What matters is how much you have to pay for it, and what it can do.