Why doesn't focus have, an open a fresh new tab feature like chrome or firefox-mobile?

Currently it supports multiple tabs but they can only be created through the links already on the page. I've read that the aim of focus is to provide private and focused browsing. I am curious to find out that how a feature like opening a fresh tab shall be against that principle. Also the web pages have to reload everytime i switch between tabs. Why aren't they saved, can't they be saved for the time i am using the app and deleted everytime i close the app or manually delete all my history?Wouldn't that be convenient! A detailed answer would be very helpful. Thanks in advance!