Thanks for the answer!
Warp has really cool features (seems to be beyond LLM?), but what kept me from trying is that its not open source, and seems to have anti privacy features, and VC-funded. It is still a very tempting product, so maybe I will try it.
Zellij seems interesting. I'll check that out!
Can you talk more about zellij? The docs don't really explain much. It seems to be a multiplexer like tmux?
One reason I haven't used multiplexers yet is that I use tiling window managers, and so the tiling is managed by that through separate terminal windows.