Why, in CB radio speak, do we use the term "roger" when we acknowledge something?

When using CB or two way radio, to end a line of conversation, or to acknowledge someone, we use the term "Roger" -Why?Why, in CB radio speak, do we use the term "roger" when we acknowledge something?
It dates back to Morse code days, when it took too many telegraph key strokes to say "received", so it was abbreviated to "r". In the phonetic alphabet in use in the early days of radio, "r" was denoted by "roger", and the term has stuck.Why, in CB radio speak, do we use the term "roger" when we acknowledge something?
You can, of course, just use plain English. No need to be "radio Joe" and use all those terms. A simple "Yeah, uh-huh" will suffice.Why, in CB radio speak, do we use the term "roger" when we acknowledge something?
its telling the person that you heard the person if you don't they may thing somethings wrong so you say that tell the other person that you herd them