Considering that there are plenty of evidence that Apple doesn't always cater to the best self-interests of the consumers, I'm not sure how much I can really trust Apple. By the way, this is coming from someone who is a fairly loyal Apple fan. It would take A LOT, and I mean A LOT for me to ditch Apple, but it's certainly possible.
I think Apple is mostly good, a lot of their ideas are home runs, absolutely, but a lot of their ideas are also just user-unfriendly to put it lightly.
As of right now, I can't think of a good reason for them to deny users from changing the log-in default screen.
Maybe it's an obnoxious branding tactic, but I mean all Apple hardware has a highly visible Apple logo already, so this tactic would be redundant.
But all of that doesn't matter.
What matters is a solution to this problem.
I'm hoping someone out there can help. (You'll be forever my hero.)