I too have found the MacBook Air family to be hardy. Have owned probably 20 of them since they came out. Rock solid hardware, modulo a certain butterfly keyboard incident or three.
Not the OP, but saying you "owned 20 of them" certainly made it sound like you personally had gone through 20 Macbook Airs in 13 years and I too had questions why.
My old 2011 MBA is still chugging along just fine, despite lots harsh use and hot tub time.
Please expand.
The nearby air has extremely high moisture content, I didn't dream the MBA would be able to sustain the abuse for so many years without getting fatally corroded.
It's taken substantial splashes and even a partial dunk or three.
The MBA surviving that is quite impressive!