The M1 MacBook air has been on sale for $799 several times.

"shitty hardware" ???

I am not aware of any PC laptop that comes close to the build quality of a MacBook Air for less.

"SSD soldered to motherboard, bad cooling, no touchscreen, broken keyboard, no way to replace battery..."

SSD soldered: It is a bit disappointing, but Apple ships the fastest SSD's in the industry.

Bad cooling: The MacBook air is passively cooled and nobody ever has complained about the M1 Air's cooling.

No touchscreen: I don't care about this.

Broken keyboard: Not an issue on the 2020+ MacBooks

Battery: The MacBook air has best in class battery life. iFixit sells replacement batteries for older MacBooks, It is likely they will sell replacement batteries for the M1 Airs as well.