I don't know what to say except that the overwhelming majority of HF spaces are made as Gradio demos and that gradio's whole design makes it far easier to do as

I don't know what to say except that the overwhelming majority of HF spaces are made as Gradio demos and that gradio's whole design makes it far easier to do async things unrelated to reloading the webpage - which is a huge thing for ML/AI demos. I don't claim you're wrong, but I claim that gradio is far more effectively profitable to know than streamlit is - i.e. Gradio demos are used far more for a top AI paper demo (i.e. NeurIPS system demos) than Streamlit is.