Swift，可选包装器。 “？”“！”我明白它是如何工作的。但为什么它比！= nil check更好

I understand how "!" or "?" works. But i'm not quite sure what the added benefit is compared to != nil checking. What is the added benefit of moving to "!?"? I feel like it's just something Apple has added but can't really see the extra benefit compared to status quo of iOS. Am i missing something here? Thanks in advance.I understand how "!" or "?" works. But i'm not