Can I borrow your 2020 MBA with heatpipe to test the theory? Or did you just make that up (again)?
I'm sorry, but there appears to be a lot of speculation about "heatpipes" in this thread with absolutely no evidence to support that a) it is possible to retrofit one, and b) it would make much difference anyway.
In fact, we already know it wouldn't make a difference because the chip is throttled to 10W – not temperature – by the firmware. Something that Mr nnoob tried to explain to you in many posts, but you just don't seem to understand.
So go ahead and retrofit that heatpipe and then re-write the firmware if it makes you happy. Somehow I don't think either of those things are going to happen. Indeed, I doubt you will even buy a 2020 MBA in the first place, so I'm really not sure why it's design seems to upset you so much.