I always hated the streaming text responses in the chat interfaces, just seemed like a cynical attention-hack to continuously update the content instead of just returning the answer once it was done, so I think email makes a lot of sense, it especially makes slow-running local models a bit more bearable, instead of watching it type at 20 words per minute, just get back to me when you reach a stop token. Plus it can attach any relevant files or files it generates. I wrote a chatbot 8 years ago (chatscript dialog trees) that would gather parameters and run a SQL script, returning the resulting table as a .csv you could download. I wish I thought of doing it as an email character, would have integrated with existing processes way more easily than "login to this service we just spun up whenever you want to use it..."