I am a principal engineer too. In the last 5 months I have been working on a project using the latest LLMs. 5 years ago that project would have required 30 engineers. Now I am alone but need at least 5 more months to have an MVP. You are just not working on projects that are complex and difficult enough. There are so many projects that I have in mind that feel within reach and I would have never considered 5 years ago.