>Now for summarizing email itself it seems a bit more like a waste of compute

This is the thought path that led to 4o being embarrassingly unable to do simple tasks. Second you fall into the level of task OpenAI doesn’t consider “worth the compute cost” you get to see it fumble about trying to do the task with poorly written python code and suddenly it can’t even do basic things like correctly count items in a list that OG GTP4 would get correct in a second.