I see this as a positive move - imagine if all the online racing threads were in the main GT5 section.
Now, if people want to head to a team thread, they'll find it in just as many clicks as before from the main page - it's just a different location. And if they do come to this Drifting sub-forum, and aren't on a team, they'll find threads that pertain to drifting, not just team thread after team thread, usually filled with comments not even relating to GT, but just one-liners involving random daily goings-on. Not sure how useful that really is.
Duplicate threads (the "beginner car suggestions" ones) are disappointing, no argument there, but that sort of laziness happens in all parts of GTP; it's not exclusive to this sub-forum. If you come across something that's been done before, the Report button could lead to a merge 👍