>That definition doesn't apply any better to the attach/detach functionality of tmux than the window management functionality
It does apply with 100% to what it's meant to be applied: multiplexing terminal IO.
It has nothing to do with "window management". In fact it could also offer no window management at all, except for switching between sessions, which is was what it did initially.
Multiplexing is a well known, precise term, and terminal multiplexing as a technique existed before both tmux and its introduction of tiling (e.g. screen).
It does apply with 100% to what it's meant to be applied: multiplexing terminal IO.
It has nothing to do with "window management". In fact it could also offer no window management at all, except for switching between sessions, which is was what it did initially.
Multiplexing is a well known, precise term, and terminal multiplexing as a technique existed before both tmux and its introduction of tiling (e.g. screen).