Raphael Bostic's comments introduce the idea of flexibility in the Fed's inflation target, which could lead to uncertainty in the markets. While no immediate change is indicated, the suggestion that 2% is not set in stone may cause investors to speculate on future monetary policy and its impact on the economy. This could result in short-term volatility for broad market indices like SPY, which tracks the S&P 500. However, since there is no concrete policy change announced, the overall impact is likely to be neutral in the short term, with a moderate level of relevance and importance due to the potential implications for future policy.