Expressiveness isn't the problem. No doubt it can be less efficient and re-usable but constructed languages are mostly syntactical interfaces to subsets of the semantics we express in natural languages all the time. By using them we can precisely express combinations that can be difficult to convey in natural languages without losing time to perspecctive and interpretation but that can only a problem if you're in a hurry. In most cases, it'd be far more limiting to have to express natural semantics in a constructed language than the other way around. What's more is that all the orimitives of these languages are developed using the same strategies we use in natural languages. It's just the morphs and structures that differ.

I just hate the feeling of chatting with something that is designed to sound human

My dad died at home in hospice last fall, and when I called the funeral home that we had selected to handle his cremation to come pick up his body, the answering service was AI. I could tell because of the weird artificial background noises, the strange accent that wasn't from any language on earth, and the fact that when it read back my father's name for spelling confirmation it said "Bob common name B O B Smith common name S M I T H?". One of my biggest regrets is that I didn't just hang up immediately and go with a different funeral home.

For extra fun, when we met with the owner of the funeral home later he kept cracking jokes. And he didn't deliver the urn until the night before my father's interment ceremony, after I had been frantically calling him about it the whole week before. LPT: don't go with a funeral home whose owner shares a name with a character from The Sopranos.