The covering letter is a sales tool for yourself, a pamphlet if you will, there to excite employers at the prospect of meeting you.
It is not a document for modesty (or stupidity):
“NO – I DON’T HAVE A DIRECT AND ESSENTIAL SKILLS TO APPLY FOR THIS POPSSITION
NO – I’M NOT A SPECIALIST IN COMAPRE TO JOB DESCRIPTION I’VE READ ON YOUR ADVERT
NO – I’M NOT A MANAGER, EXECUTIVE, HOD, BRAND OR ANY OTHER TYPE OF REVELANT PERSON YOU WOULD LIKE TO HIRE”