EVERY time you restart your computer, you get the obnoxious control center which wants to run an install (on a printer you probably don't have connected) and takes a minimum of 2 (3 in my case) clicks to dismiss, and it's slow to boot!
Then you remember, click on the system icon, go to preferences, uncheck display at start up, hit ok, and you're done.
Then you reboot again and BAM! There's Brother right back in your face with the obnoxious control center again.
You angrily click through to close it out, go BACK to preferences, UNcheck the startup option, and hit Ok. Now, because you're NOT crazy, it's time to make sure it saved what you did. You go BACK to preferences again AND IT IS STILL CHECKED!
But let me share a secret with you.
Let me save your sanity!
Open up a terminal, and type the following:
Now, go back, one last time, into Preferences, and uncheck on startup, and press Ok.
Ok, fine, you can go check it again, but look! It's listened to you!