I do prefer tools like GPT researcher where you are in control over sources and search engines. Sometimes you just need to use arxiv, sometimes mix research with the docs you have. Sometimes you want to use different models. I believe the future is in choosing what you need for the specific task at that moment, eg 3d model generation mixed with something else, and this all requires some sort of new “OS” level application to run from.

Individual model vendors cannot do such a product as they are biased towards their own model, they would not allow you to choose models from competitors.