Yes the Air can get hot if you actually look at temps. The first few hours of using it I was thinking this laptop is extremely quiet and didn't hear any fans. After installing some of the apps to monitor I was suprised at the temp when running certain things, I thought it was much cooler because the case barely felt warm. Which is a good thing because even at 100c, the heat dissipation is very good and you wont really feel it. Even if fans are at 4-5k I can barely hear it. I think fan noise is greatly overblown in general, I guess most people have never had a loud windows laptop or desktop.
Beating a dead horse, lots of people will disagree with my subjective experience, but I returned my i5 because it was way hotter and louder than the 2019 version (externally and internally) for no noticeable performance gain day-to-day.
The reason I switched to the Macbook Air line in 2013 is because I was sick of hot, loud Windows laptops. I haven't seen too many reviews of people who've transitioned from previous gen Macbook Airs - it's mostly Pros.
Compared to a Windows laptop, the 2020 MBA may well be cool and quiet. For an older Macbook Pro, the same might be the true. But for a Macbook Air, it's demonstrably hotter and louder than what came before it, with pretty marginal performance gains. As everybody says, if you're doing sustained CPU loads, the Air will scale back power - you're better off with a Pro.
The 2020 i3 I replaced it with isn't too bad so we've kept it in the house - the only reason I'm not using it is because the power draw on Bootcamp is twice that of the MBA 2019 (bad drivers?).
I dunno, people buy computers for all sorts of different reasons. I buy Macbook Airs because I can take them anywhere, they're not lap roasters, and they don't annoy me with fan noise. I hope a 2021 MBA brings these factors back with more consistency, but who knows.