It’s not even that it’s completely different - text emojis are more expressive. Less is more. And I’m not arguing that you can’t use emoticons in more than one way to convey different emotions or intentions, but you just can’t use :D and 😀 in the same way. Where you can use :D to be anything from snide, trolling, taking the piss, happy, excited etc you need a whole lot more emoticons to cover all that the :D can cover.
To add to the other commenter about cleaning walls, clean your drains, like especially sink drains. There are flies that live specifically in drains. You also gotta nuke them for a while until it helps with drainflies.