Angstroms are like cm - we could express everything as 10x mm or even 1/100 m, when you are deep in the subject matter having intuitive units facilitates commun

Angstroms are like cm - we could express everything as 10x mm or even 1/100 m, when you are deep in the subject matter having intuitive units facilitates communication by abstracting the 100pm or 0.1 to an A is helpful as that is the order of magnitude that covalent bonds exist within eg Bohr radius is roughly half an angstrom and width of H2 gas is just under 3A By expressing them in pm they actually lose some context as then they're all just numbers. Daltons is a similar concept that springs to mind