Ishna Ji..those are GRAMMAR MARKERS...to indicate Proper Noun, Singular etc..
Similarly it may be asked.."since the full stop is silent and not pronounced..can we stop putting full stops , commas, semi colons and also stop using Capitals to indicate Proper Nouns in English. At the time Gurbani was written the only Grammar marker was a dandee and double dandee...and Gurmukhi doesnt have CAPITALS..and on top of this Gurbani is written in Compact Poetry format in which many (words) have to be INVISIBLE but never the less UNDERSTOOD despite being invisible !!
There was one guy..a pseudo professor form Kerala a Prof Moorthy who managed to somehow convince the DGMC to give him a multi million rupee Grant to translate the SGGS into South Indian languages. He began his "project" by getting a copy of the SGGS..and PHYSICALLY CUTTING OUT ALL those Siharees and aunkarrs which he labelled as SUPERFLOUS !!! His argument was the same _ these are NOT PRONOUNCED..so serve no purpose and cant be translated.He would have done a huge amount of Damage had some eagle eyed sikh not come across him cutting the sggs pages..and the resulting hue and cry forced the DGMC to kick this Prof out.
In the Days of the TELEGRAM...the Grammar markers in English which are SILENT...and therefpre not pronounced..BUT ESSENTIAL....were written in as WORDS. Example of a telegram...." I am not coming tomorrow STOP I will arrive on Wednesday STOP Dont worry STOP I will manage to reach on time STOP Please tell daddy not to worry too STOP The WORD STOP is inserted for the FULL STOP DOT ( . )
Hope this clarifies...