All you need is someone to start locking up threads so that you don't get waves of redundancy.
I would agree with you in this case, but moderators are not doing that very often or not at all, even with obvious case of spamming like for Livecoin dead thread that is still active in similar way.I reported several times and asked for locking of that thread but my reports are still unhandled so I gave up doing that.
Other more thing that should be locked or moved to trash is duplicate topics, so we have multiple topics with exactly the same title and content across forum.
If I were in charge - that's a scary thought, isn't it - I would probably appoint a couple of moderators to each of those underserved boards. For example nutildah and DireWolfM14 for P&S, LoyceV with o_e_l_e_o for BD/Press, dkbit98 and Lucius for Croatian boards, mainly to punish them all for complaining so much 
but also to give a bit of a proactive push to clean those boards instead of waiting for reports, which could be a good deterrent without banning. And I'd hope that having two mods work out some sort of agreement between them could help with the inevitable bias accusations and moderation complaints. If they start slacking a year or two from now, pick someone else from active users.
Being a moderator can really be a punishment and not everybody could do it, but I think that Croatian board is probably the only active local board that don't have local moderator, so Cyrus is doing out work even if he doesn't speak out language. but also to give a bit of a proactive push to clean those boards instead of waiting for reports, which could be a good deterrent without banning. And I'd hope that having two mods work out some sort of agreement between them could help with the inevitable bias accusations and moderation complaints. If they start slacking a year or two from now, pick someone else from active users.We are still not in emergency state yet, but we could end up like any other board and we need some cleaning up and reorganization.