Boomer culture shifted to the millenial generation, acting as the distinguishing trait on internet forums from Gen Z(oomers), and Gen Z are adopting the millenial teenager hipster traits.
No, it is not immature to use emojis or emoticons or Lennys. They are communication tools, just like words and phrases. I think of them like spices. You have to be an artist of grammar to correctly use them, to add flavour to your sentences.
I can't wait to read printed text that has them to better enunciate certain plot points. Harry Potter could have used an 😱 or two to let me know in advance how to react to certain moments.
Realtime fast communication does not need to be the same as books written for centuries. Nobody is printing JSONs of internet comments as novels and biographies.
I'll give you that, emojis are good at quickly communicating intent in situations where time is short. But this is a message board, where's the hurry buddy
The average lifespan of a thread on Reddit/Lemmy style discussion boards is about 18-24 hours. If factored in a lot of international participants across polar timezones, it can go upto 30-36 hours atmost. That is a very fast exchange of messages when the comments start piling up.
Slow exchange of messages is not what you are having here. A slow digital exchange would be something like email.