The Ioniq5 has 2 types of seat. The standard one is OK but the relaxation seats are a class above.
Both my wife and I have different back problems we have tried a bunch of cars including the Ioniq6 with the lower grade seats and the Relaxation seats really were the most suitable, closely followed by the Mach E seats.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark