The feature you're asking for is a terminal multiplexer. You want one built in, but to suggest terminal multiplexers are a workaround to requiring a terminal multiplexer is a stretch.
It is not a terminal multiplexer feature, it is one of the terminal software itself.
I do not know if you read my initial commment, but MacOS Terminal (native app) has this feature. And it is not a terminal multiplexer like tmux or what you proposed.
I am not interested in workarounds.
The feature you're asking for is a terminal multiplexer. You want one built in, but to suggest terminal multiplexers are a workaround to requiring a terminal multiplexer is a stretch.
It is not a terminal multiplexer feature, it is one of the terminal software itself.
I do not know if you read my initial commment, but MacOS Terminal (native app) has this feature. And it is not a terminal multiplexer like tmux or what you proposed.