Well anything with a very flat profile would never work for my body. One may assume that one needs the same amount every hour of every day and night (in the absence of extra activity or any food) but getting a pump and the intense basal testing you need to do in the first couple of months, proved to me that my body's requirements and FAR from even! it's gobsmacking where a rate adjustment of 100th of a unit of insulin during one or other particular hour, can make such a big difference to your control.
Obviously I'm not permanently adjusting rates by such a teeny amount - but you could if you wanted to be that ruddy OCD !