Most of what you enumerated is not a terminal emulator job.
Says who? You aren't the arbiter of what software gets to handle each job.
Tmux does a worse job than Wezterm while being more complex, a pain in the ass to configure, and feeling less native than just using the built-in tabs and panes of my terminal. Ive also had it break the output and interfere with the keybinds of many apps. Why the hell should I install and configure an extra tool when Wezterm does what I need perfect?
And if you want image rendering, what a hell you use TUI for this?
Because I like using a TUI? I do the large majority of my work in my terminal, so why should I swap out of it to look at a picture when Wezterm does it just fine? More importantly, why do you give a fuck what tools somebody uses if they work for them?
I dont give a shit about "Unix philosophy", Wezterm works better for me at all of these tasks than any other options.
GUI programs can also be controlled with keyboard.
I have never seen a GUI file manager with the same level of control using a keyboard as the average TUI file manager.
Seems like they havent merged native Wayland support yet? Thats a shame, its been working great with GE-Proton. I also wonder if raw input support will make it in.