Wezterm has built in ssh support where if you open a wezterm ssh window to a remote host and then open new tabs/splits within that window, the new tabs/splits are added as part of the existing ssh session automatically. It also allows you to host the session on the remote machine (kind of like tmux) and when you connect you get back all your previous tab/split organizations. From that perspective it can make sense to have the terminal own the layout organization.