Maybe I'm just an old curmudgeon but things like "you can use emojis as variables" (or in this case "the extension can be an emoji") scream amateur hour and a lack of seriousness to me. There's zero benefit, IMO, other than "it's quirky".
Which is a shame because the people who created Mojo are definitely not amateurs.
These things seem unrelated—experienced people are allowed to have fun too. I don't see how this correlates with lack of experience at all. This just speaks to your personal bias against having fun.
I looked through the mojo docs and it looks like the tech behind mojo might be great, but they have a really weird marketing strategy. So I'd like to believe that the emoji extension is the annoying marketing half of the really cool tech behind it.
Which is a shame because the people who created Mojo are definitely not amateurs.