Zellij 0.45.0: nested sessions, Kitty graphics, a fresh UI

Switched to Zellij a few years back mostly for the sane defaults, I expected to come crawling back to tmux, but it's actually stuck quite nicely and has become a staple in my workflow. It hasn't been a perfect experience, but I like it a lot and I'm happy to see a new feature-rich release like this.

Being cheeky here, but how many terminal emulators and multiplexers do we need?

What is driving the Cambrian explosion of CLI tools in the last ~5 years?

I’ve been using Linux since 2001 and use standard Konsole on zsh. I have a graphical desktop environment to deal with windows and showing pictures alongside them. Is it perhaps because I am an Emacs person that all I need exist within its loving embrace?

What is the purpose of the "zellij" in the top left corner and why isn't there an option to remove it?