Every business should try and improve its operational processes, but when you do that, inevitably you end up streamlining processes and eliminating a lot of inefficiency. This, of course, is not in your best interest, since it will be clear that
a) you are basically doing nothing and can be shot, or
b) you can do a lot more.
Both options are unfavorable, but obviously you want to stay employed. So what about the silo? Well, it is paramount to protect the silo – there are unique business needs that your business has that are not easily identified in those simple minded process flows, and the culture of the company is dependent on change occurring over time, so you must recommend or support solutions which respect those silos and paint a picture of the new process being a big improvement over the old way of doing things, but really, only a small amount of improvement has been implemented, and the net impact on your job is slim to none.