It's obvious to people inside the field too.
Honestly, these things seem to be less obvious to people outside the field. I've heard so many uninformed takes about LLMs not representing real progress towards intelligence (even here on HN of all places; I don't know why I torture myself reading them), that they're just dumb memorizers. No, they are an incredible breakthrough, because extending them with things like internal thoughts will so obviously lead to results such as o3, and far beyond. Maybe a few more people will start to understand the trajectory we're on.