I used to be a PC Windows user and switched to Apple to be more aware of what some of my family thought was superior, and ever since I find that Apple is not friendly to users of their product line and have a mindset of their own. Support, will not support, in issues that, in my opinion, is just common sense to help with, if that makes sense
In previous versions of macOS, I have been able to change the "boot screen" by changing some of the settings by adding a folder and image that I preferred. That process, I may have deleted that as the first couple of installations of Ventura worked and so I assumed Apple may have corrected the most hatted flaw by many users of not being able to change the boot image. However, in my latest macOS, it appears that things may have changed back to the dreaded meaningless screen, which may represent the misguided thinking of so many confused people around the world.
My research found this website but I have not attempted following the steps as it is more complicated than what I previously had. If you have the confidence and knowledge of how to follow the instructions below successfully, let me know.
Here is the site: https://apple.stackexchange.com/questions/452474/how-to-change-the-initial-login-screen-background-in-macos-ventura