If you look at why indexing works, a lot of the studies show that most stocks don't do much. 2/3 of the Russell components don't beat their own index (and I believe about 20% go to $0). Yet, there are a few outliers that carry the index upward. Its the huge sucessful companies, the NFLX's etc.
What these 'bubble stock' skeptics do, is to basically fade the companies that are showing signs of being those convexity winners, the ones that go into monster runs and carry the index. I mean, that's got to be the stupidiest idea in the history of investing. Its no wonder that these idiotic skeptics tend to be drawn towards having 'small position sizes on shorts', its because their subconcious tells them its the appropriate amount, so does their experience (they get burned a bunch of times and realize the strategy deserves less size) yet their concious mind screws them up and they never realize the folly of the strategy altogether. If they were to listen to their subconscious, they would realize there is a lot of wisdom in their desires to be smaller in shorts, its telling them something. There is 'convexity wisdom' there, but their concious mind is blind to convexity (because of the contrarian bug that they have), so there is a conflict there which is why they continue to throw money away
What these 'bubble stock' skeptics do, is to basically fade the companies that are showing signs of being those convexity winners, the ones that go into monster runs and carry the index. I mean, that's got to be the stupidiest idea in the history of investing. Its no wonder that these idiotic skeptics tend to be drawn towards having 'small position sizes on shorts', its because their subconcious tells them its the appropriate amount, so does their experience (they get burned a bunch of times and realize the strategy deserves less size) yet their concious mind screws them up and they never realize the folly of the strategy altogether. If they were to listen to their subconscious, they would realize there is a lot of wisdom in their desires to be smaller in shorts, its telling them something. There is 'convexity wisdom' there, but their concious mind is blind to convexity (because of the contrarian bug that they have), so there is a conflict there which is why they continue to throw money away