

I know yanks hate decimal and stuff because of how hard the mental arithmetic is, but it’s half of the more significant digit. I guess and they wanted more precision than 10s, but don’t see the need for 1s, so they split it in half or the equipment is not capable of more precision.
TBH - I don’t know what a dungaree fezundheit is anyway, but I’d imagine 5F is way spurious accuracy already for a domestic oven. I reckon you’d need an industrial or scientific kiln for that type of accuracy - so it’s probably more a psychology / user interface thing. In which case the answer is, ‘because enough customers are happy enough with it as it is.’



It’d mean we’re all gonna be just dirt in the ground.
Evolution dosen’t make “mistakes” though, and there is no “progress” or “development”; those are probably self-deception by some lifeforms that are too self-aware.
Evolution just ‘happens’, and the resultant mix of lifeforms and traits mutually ‘adapt’ to the ecosystem and wider environment.