AsslamuAlikum hope your doing great I'm very impressed bro from your post. Specially from your this point m that.

• Also, there should be a technology that would alert a user if his/her data are inputted in a new device.

Yes if this opetion will be include then security will be improved about 50% more and also the opetion for permission with notification should also be included. If we will allow login then it should be logged in on another phone