Stores will simply charge u for so called waterproof covers. One plus doesn't sell its phones as waterproof. Eventually u need to take good care of...
More often than not it remains out of stock. Nothing to do with launch of one plus 5
There are hotshot managers in Playstore. You need to pay to purchase them to use premium services like your requirements.
The best one is by one plus. Check one in amazon. Priced approx 900 by others.
The earliest launch of 5t would be in 2018.
3rd party might help to some extent only. Instead, get used to the notification. It's not that bad to look forward to adding something from Playstore.
The case will help cover the sides n back. The tempered glass saved the screen
Just an upgrade. Go for it if u wish to.
Not too sure about the brand. The previous installed one just works the way it should. On a fall the phone would be safe. Rest assured.
Sufficient enough a protection Pre installed. Dnt remove it.