The main game of real 'turners' in AH has always been mostly in furballs and in defenses vs CVs close to shore. Both are environments where you can find enemies getting low and slow enough to play with them even in something as slow as a Hurri I.
CV battles are still there, but the classic furballs had a massive decline over the years (for various reasons. And no my younger friends, a base capture that doesn't succeed within 5 minutes is still not a "furball")
As both he number of players in a specific battle went down as well as the overall MA speeds went up because of changing environment, the pure turners are becoming a less viable choice.
Back in the day there were tours I was occasionally using planes like the BF109F or even the Hurricane I as a prime ride for a tour or so. For example tour 92, when I got 300 kills in the Hurricane I.
There would be no way to pull that off again these days. With so few players in my timezone on such large map, enemy airborne targets mostly consist of high bombers and single fast town smashing jabos & field porkers.
Finally, I'd like to point out that even the use of the dreaded Spit 16 has been significantly going down over the past 6 years. For years it was competing with the Pony for the #1 spot.
In the current tour, for example, the top 3 killers are P-51D, La-7, Fw 190D.