Thanks for the thorough testing, really valuable.
I had planned to replace my 2018 i5 with the 2020 Quad Core i5, but I really appreciate this computer being dead silent and cool to the touch. Like you say, I hardly ever hear the fans and it's probably due to the fact that it can run at 0 RPM.
I was so looking forward to the Quad Core, but I also had a 13" MacBook Pro previously and I do not miss that heat/fan noise. Very unappealing for a modern laptop.
Looks like you can't have your cake and eat it...
I think I will actually stay with my current Air longer than I had planned. At least I've got 2 more years of warranty on the keyboard if it does go wrong.