those cabinets are all built to standard dimensions though

your "builtin" fridge isn't really builtin, it just has cabinetry (plywood + veneer) on both side and the top in a standard dimension...its not like the home was built around the fridge

in most homes even the "builtin" cabinetry work is cheap garbage that can be replaced trivially, particularly in the case of white-finish just in most homes now