Why isn't it used in everyday transactions or why wasn't it implemented?
If you send Bitcoin to a normal address, it simply appears on the blockchain. But if you send Bitcoin to a Silent Payment address, your wallet needs to do much more work to find which funded Bitcoin addresses belong to you.
Even with all that work don't you think this thing should be added since privacy is involved here? Or does it comes with other disadvantages? More cost? Please enlightened me if you can. I really don't know / can't understand why this isn't suppprted by many.