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I highly doubt that Samsung or Google would intentionally forbid displays in any portion of the screen. Can you imagine the time needed to sit and decide, Snapchat can have these four quadrants, Instagram these three, this alarm can only have two sectors... It's more than likely the app. There are around 500 different devices produced each year that support Android and developers have to either target a handful of devices or create something so generic that it "works" on most devices. That's taking into account screen size, screen ratio, processors and on and on and on.
I guess my question is why is the upper right portion of the screen in particular so desirable? There's no way you could get used to a centralized display? There had to be a time before you began using the first, now unsupported app, when things were different and not to sound callus to your desires, believe me I understand loosing something you like or having to deal with change but to me the most important thing would be finding something that worked. In a sea of apps finding that one that works and isn't annoying in some other way is not always the easiest thing. Just a personal account of loss, I really liked this one SMS app and it had two features I really liked but never really gave any thought to because that was just how it was. Then I got a new device that it worked on but there were issues. Finally I gave up on the app and decided to find something that worked without the issue. I ended up loosing both of those features I really liked and had never really thought about. I didn't even know I liked them that much until they were gone. I searched and searched, installing this and that for a day, a week, whatever only to find other things in the apps I was trying I just could not live with. I finally settled on an app that worked, didn't have any of the new found annoyances but also lacked the two things I really liked about the first app. To be honest after a little over a year of being with this new app I can only remember there were two things that I missed, one of which I can't even remember what it was. The other was the automatic reply when I'm driving. That one is etched in my mind because I found a clever way to get that back.
Text is a funny thing you can almost never guess the person's disposition when reading a comment. Sarcastic, antagonistic, humble, sincere... I'm being sincere and apathetic to your question when I say in a sea of Android users you're not likely to find another user that finds alarm placement as important as this is to you.