Yep it's just software. Samsung could simply release their camera app on the playstore for the GPE of their devices.Or simply include it in the GPE rom for that device, just like how HTC's camera features are still present on it's GPE of the M7 etc..
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Yep they are actually referencing to our threads on XDA - I have one on S6e sub forum and the other on the S6 sub forum.
The app refreshing is annoying as hell for me. For example I could be writing this post - pause for a second to open a link in chrome / samsung browser to copy and paste the URL, and then maybe send a text message or check my calendar - but when I click on the app to go back to finish a post in Tapatalk - the app has to refresh because its not been kept in memory - which then deletes what I was doing and dumps me back to the main menu. So no matter how quick it refreshes - it doesn't undo the inconvenience of being dumped and losing what you were just doing.
Simple things like this should not be causing app refreshes on a 3gb device. Heck a moto G doesn't do this with the same apps let alone anything more powerful.