"This forum used to challenge me, years ago when I recently joined in. I feel like it lost its touch, somewhat. I think you overestimate this forum. No offense to recent members. the doc up there^ has a good relationship with knowledge."
Word, It's maybe not the rest of us, it's maybe one aspect of your INTP coming out: It's not new and glittering, you know what to expect, so you are somewhat bored with us. A certain number of people come, stay a year or two years, then move on. Others of us seem to stay forever. But the forum itself is indeed constantly changing, with new people coming in, lurkers coming out and surprising us with their insights, etc. And it's purpose isn't to challenge anyone, that's just an occasional happy byproduct. The forum just "is." So maybe, just to overthink things some more, you have inappropriate expectations?