Probably perception. I have been listening to conservative talk radio and they are talking like this is the best economy we have had in 20 years. Doesn't seem to match reality (seems like an average Obama year). However remember that many times optimism will sometime fuel economic growth.
There are massive expectations that the corporate giveaway will throttle up the economy. I don't think anybody is addressing the 2% tax cut on billionaires (which will have a dampening effect at best). If they had given the middle class a 2% tax cut, that would have stimulated the economy far far more. In the end, most of the middle class will get fucked. Middle class Americans in the market will profit greatly until it crashes. You are a smart guy Eski, when should I take my profits and wait for the crash? I think I am completely safe in the market for at least the next year.
https://tradingeconomics.com/united-states/gdp-growth