Same complaint but I am adapting. Overall I think the grouped topic will be better in the long run.It's 2 clicks to go back to the main Lightning forum on mobile, so that's where the frustration lies for me.
Wow, I just learned that you can filter new posts to only show Lightning topics!Interesting. I use the "Unread Post" button and go through threads with newest posts first. This avoids any grouping and excessive clicking.