Here is my two pennies worth on this subject.
The “Pleather” seat covering in the Gen1 and the Gen2 ZS EV found in the higher model range, is NOT a fully breathable martial that’s for sure.
This is more noticeable in high summer, when it can get a more than a little sticky at times in the lower back area.
The addition of the PVC / Plastic is the cause of this problem.
I can remember when travelling a distance in our previous Gen1 in the summer time in the U.K. my “T”shirt would become definitely damp at the very bottom area of my back.
Use of the HVAC is great, but it is unable to provide cool air from circulating where the bottom of my back comes into contact with the bottom of the seat back.
I have owned many car with both full cloth, half cloth / half Pleather and full genuine leather, which is more breathable, but it can still produces a similar condition.
Leather seats are very cold in the winter time and that is why they almost certainly include the addition of a heating function !.
Hot in the summer time can be uncomfortable, so high end models have ventilated the leather seats ventilated.
The best combination of seat material I ever experienced, was a VW Golf that had Pleather side bolsters cushions and a breathable alcantara material in the centre section of the seats.
It was never cold in the winter ( unlike leather or Pleather ) and never became hot and sticky in the really hot summer weather.
So, I can concur that in the height of summer, the Pleather seats can get a bit sticky in the lower back area, on a longer journey.
Any other times, they are fine and the heating function is in daily use in these colder conditions right now.
When we use my wife’s car ( full cloth ) she constantly complains that is has no heated seat option !.
So, would I switch out the Pleather for the material fabric ??.
NO - The Pro’s out weight the Con’s IMO.
I am about average size and weight.
My wife is slightly smaller ( in all size respects ) and loves the heat provided by the heated seats in the winter time.
But has made a commitment that if she wears shorts in height of summer, the backs of her legs will stick slightly to the base of the seat cushion.
Which does prove the point I guess ?.
Pre cooling of the cabin is a must or the seats are really hot to the touch of bare skin if the car has been parked in strong sun light of course.