Understanding separation of technology and why.

Why do companies lump departments together like they do not understand what C level VP or Director to assign the tasks or employees too?...because "we've always done it that way?" Putting IT and telecom together without really evaluating the difference is not a good decision. Telecom needs someone from the industry to at least oversee and have input into access and equipment purchases. Telecom needs separate traffic reports, separate technology and sometimes separate lines from data applications. Some resources can be shared but not necessarily. Applications, technology and methodology all play a role in decisions for access and equipment. Just because a company is given as a referral for one or the other, does not qualify applications, etc. for your corporate departments. Respecting a corporation is not a qualifying decision process. Why did they buy from a vendor and how the vendor did the needs assessment is totally unique to your firm. After 10 years of pricing, project managing and solving problems for some of the US largest comporporations, it blows me away to find some corporate ways of decision making so sophomoric.