It's not an indicator problem, it's a problem of people trying to time markets. Also, there are two ways to use the Buffet Indicator - right and wrong. The wrong way is to say 'it's overvalued, I should do something - short the market'. The right way is 'it's overvalues, I should avoid doing something - buying overvalued stocks'.
Buffett has been sitting on piles of cash in the past for years and years, avoiding buying securities when they are overvalued. He never tried timing the market, simply waiting for the right moment. Nor did he sell stocks when they were overvalued in order to try to buy them back at a lower cost at least AFAIK from reading his biographies. So, for a value investor, it's a useful tool.
Buffett has been sitting on piles of cash in the past for years and years, avoiding buying securities when they are overvalued. He never tried timing the market, simply waiting for the right moment. Nor did he sell stocks when they were overvalued in order to try to buy them back at a lower cost at least AFAIK from reading his biographies. So, for a value investor, it's a useful tool.