I use them and stay up to date reasonably. I have used NotebookLM, I have access to advanced models through my employer and personally, and I have done alot of research on LLMs and using them effectively.

They simply have limitations, especially on deep pointed subject matters where you want depth not breadth, and honestly I'm not sure why these limitations exist but I'm not working directly on these systems.

Talk to Gemini or ChatGPT about mental health things, thats a good example of what I'm talking about. As recently as two weeks ago my colleagues found that even when heavily tuned, they still managed to become 'pro suicide' if given certain lines of questioning.