There appears to be significantly less to talk about with the shows in the image compared to what you listed. Not to mention that I've only seen the bottom two and only really got into P&F. For SoL shows to get threads, your most common talking point would be discussing would be antics or situations. This includes shippers, but their threads don't always bring the same discussion other shows get.
In the case of P&F, I think people discuss it enough in other threads that they don't need one dedicated to it. It's also relatively old and a lot of anons have exhausted their invention / inventionator of the day in threads past. It still gets threads, but yeah, nowhere near as popular as other shows.
In addition to the generic SoL talking points, the following shows get more threads because:>Hey arnold has several over arcing plot threads between episodes. Also has massive amounts of HEART.>Bob's Burgers is either newer and or way more popular than in pic related. Also somehow waifuism.>The Simpsons and spongebob can be endlessly bitched about how old good, new bad. They're also some of THE biggest cartoons, period.>As a Mike Judge cartoon, KOTH is grounded in ever relavent satire. KOTH is more popular than anything in pic related. People love inserting Hank and his friends into everything, including shit like Jojo.