They don't have to adhere to a strict formfactor like atx/matx (which weren't standard for quite some time, but regardless). The ability to change out parts lik

They don't have to adhere to a strict formfactor like atx/matx (which weren't standard for quite some time, but regardless). The ability to change out parts like memory/disk/wifi, expand the I/O, and replace the mobo entirely (or even repair single failed components, or take to a shop that can) is the biggest thing for me as a user.