They're a great way to "inject" something into a sentence, similar to how people speak in person. I feel like my written style has now gotten worse because I have to dumb it down, or I'll be anxious any writing/linguistic flourish will be interpreted as gen AI
So icons make power users faster. It's not "clutter". Your argument about "don't use it for aesthetics" is ironic because you're making it because of aesthetics. For me it's about user speed.