The thing is... Interactive updates happen, just in a different way than it does for animal brains. The system is updated with new training data more-or-less constantly. Suppose OpenAI (or whoever) collects a week's worth of conversations with up-thumbs and down-thumbs, or rewritten continuations from human operators, then fine-tunes the current version of ChatGPT with that data. That's an interactive update, and learning from experience. It looks mostly nothing like what we humans do... But it does rhyme a little bit!

We humans have mostly frozen weights (neurons), or else we would constantly be having to avoid forgetting how to walk+talk. We have a period of greater plasticity (youth!), and use sleep and dreams to perform 'deeper' updates than occur when we're awake: We tend to suck a bit at picking up new skills from zero, but improve rapidly with practice over days.