I want to add that I've been using tmux for the last decade.
I went from gnome-terminal, konsole, multiple remote ssh sessions (tmux on the remote side for long running sporadic jobs like repairing databases), Windows Terminal, iterm, iterm2, kitty, putty, etc etc etc. From ancient Ubuntu (from CD-ROM giveaway era), to modern MacOS releases, from several Windows releases.
Happy camper of wezterm for the last 6 months. Alacritty as secondary, Windows Terminal on my gaming machine (wsl2 for some stuff).
Between them: still the same tmux config, just evolving, changing plugins, colors of the status pane, adding starship.rs to the mix. Very tempted to try zellij harder, but not sticking to any of these terminal interfaces provided me lots of flexibility and consistency.
If you use multiple OSs, tmux offers a consistency that paned terminals cannot offer.