Concept wise, we don't even know how much a 6th gen will differ from a 5th gen.Like a bloody clockwork...
YF-23 flew over 30 years ago and now in a museum and GCAP is just a mock-up. 6th gen is barely more than a concept right now, we are trying to build a 5th gen from scratch which is hard enough as it is and you want 6th gen?
How about we get enough Kaan for our protection first, then we worry about changing its design to make it 6th gen?
Or should we keep acting like kids who want their dessert before finishing their dinner and change its design and put ourselves back several years?
The most important features of a 6th gen would be : AI/Autonomy and Network -Centric Warfare where the 6th gen frame utilizes and communicates both with ground and air systems such as Satellites, Drones, Radars etc.
There are of course other important features too but i personally believe that those 2 will be deciding factors of a 6th gen fighter.
YF-23 vs YF-22 debate is always the same, one is not better than the other, one design excels fully in stealth and speed while compromising maneuverability and the other one compromising on stealth to be more balanced all around and better maneuverability.
One is not better than the other, both have it's usage but YF-22 winning the competition is really normal when USAF already had so many stealth platforms.