A have it so that my shell always opens tmux, unless it’s a login shell or dumb shell.

# ~/.bashrc
## Top of your RC
[[ $- != *i* ]] && return          # If not running interactively, don't do anything
[ -z "$PS1" ] && return            # If not running interactively, don't do anything
[[ $TERM == dumb ]] && return      # If called from emacs, don't do anything

## Put the rest of your code here

## Bottom of RC
shopt -q login_shell && return       ## If this is a login shell, load all except tmux

if command -v tmux &> /dev/null && [ -n "$PS1" ] && [[ ! "$TERM" =~ screen ]] && [[ ! "$TERM" =~ tmux ]] && [ -z "$TMUX" ]; then
    tmux attach || exec tmux new-session 
fi

That way, I always have persistent terminal sessions and don’t need a terminal emulator that has tabs since I can just do multiplexing in tmux