"No Where To Run" Why not short?

I keep reading articles about "no where to run" for investors between stocks, bonds etc. I am fairly new to investing, but if you are not going to day trade yourself, why not put some money in a reverse etf index? For example DOG inverse dow jones etf

That way you can make something on the way down to the bottom (just riding the trend line not trying to anticipate the bottom) instead of just pulling your money and having it sit in the bank. Recessions typically last a certain duration so you can extrapolate where you are within the trend line.