The way I browse discussions is just scroll from top to bottom on the main Community page. I don't use the categories on the right side.
Unfortunately the main page only shows something 10 discussions (plus the featured post). Once I see all 10, there's nowhere else for me to go. I can open the specific categoris to see top 10 from that category, but again there's nowhere for me to go after that.
This makes browsing all discussions impossible, and only discoverable by using the search bar.
A simple row of page links or "next" and "previous" buttons would allow people to view older posts, not just the top 10.