Because I don't need the launcher. I start most of the programs I need on boot and they go on for weeks until the next reboot (emacs, terminals, browsers, Thunderbird, keepassx, Telegram and 32 GB of RAM.) I use a virtual desktop (a Gnome activity?) per project so I have very few windows open per desktop and I alt tab between them. One browser window per desktop, one terminal per desktop, one emacs frame per desktop, Slack, etc. BTW, I wish that desktop Slack had an option to display multiple windows. Doing it in a browser is obvious but the desktop app is better than the browser one, so I drag it into another desktop when I change project. I run the other programs by pressing the windows key and typing their name, not every day or week. What I use my bottom bar for is to access the icons in the notification bar. Glance at the time, open or close a VPN, take a screenshot with Flameshot. I also placed the favorites menu there (some extension?) to start the file manager. I'm using Nemo instead of Nautilus because I like to predictably access files and folders with type ahead. I occasionally use the bottom bar to click on the name of a dining program and it's nice to have see them side by side as in old Windows versions.