Thank you for your feedback and for reporting the issues you've been experiencing on your device.
If you would like to have any changes implemented on your device, I truly recommend you to post them on Beta Community. If they are not too personalized, we can forward them to our development team, and it is possible that some suggestions can be introduced in the future. The user satisfaction is vital for us. Our developers are working hard to improve the battery life, overall performance and smoothness of interactions on the software. I am sure further improvements will be visible soon. I hope your experience with Samsung devices will quickly improve and you can notice benefits of using the Samsung devices!