That TDP numbers confirm my post.The 1035 is a 15W 'U' CPU, whereas Apple is using Y CPUs in the MacBook Air. It is not "nearly identical". It's not fully clear yet what exact part Apple is using, but it looks like their TDP is around 10W (there are announced 9W parts, but Apple gives higher clockrates, so they may have cTDP'd those up to 12W; someone said they are instead using more recently-announced 10W parts). So the Surface would have 50% more thermal headroom.
And it's not like the Surface Laptop 3 isn't known for heating problems…
If anything, it's Microsoft that put too hot a CPU in there, not Apple.
Let's say you have 15w vs 10w TDP in almost identical dimensions.
(MacBook Air 11.97 x 8.36 x 0.61 inches, Surface Laptop 3 is 12.1 x 8.8 x 0.57 inches)
While quad mba have a serious temperature problem (as shown in many review),
microsoft thing doesn't known for overheating. (except when charge ;])