The logo was removed because others wanted to have it removed, just like you want it to be back now. It’s an eternal back and forth about a feature that has no function.
The logo is still on the logon screen, but not on the lock screen. However, if you want it on the home screen, you can use Katapult launcher and one of my wallpapers, because I also made a wallpaper with the Mudita logo, just for the home screen. The download is at the end of this thread: