I've read this and this about using Fragments.
There is an example for how to handle multiple Fragments on a tablet and handset with separate Activities for each Fragment (long story short):
With each item of ListFragment 'A', a new Activity for displaying Fragment 'B' is started.
What is the advantage of using separate Activities for each Fragment instead of using Transactions?
如果您想将您的应用程序移植到可能不使用片段的手机，因为屏幕太小而无法显示彼此相邻的 2 个片段 - 使用活动可以让您非常快速地移植它 - 只需为每个片段打开另一个屏幕同时显示片段
实际上，这就是您提供的第一个链接的“设计理念”部分的含义
I see none. If my app runs on tablet I put more fragments on the screen as there's room for this and I got just one activity in which I replace fragments when needed. When it is launched on the phone I got less fragments I still follow that pattern - I got single activity and replace fragments in it. I see benefits of that approaches vs using many activities like less flickering, have one logic for whole app.