[boxy310]

Asset prices are depressed during bear markets. Those make incredibly good times to buy, because when the market jumps back up your dollar during bad times becomes so much more valuable when those assets appreciate during good times.

If anything, during good times it may make the most sense to store value in liquid accounts and wait for fire sale prices when the economy craps out. But some consistent growth is better than none, due to dollar cost averaging (i.e. you don't know whether asset prices are going to go up or to go down) [1].

[1] https://en.wikipedia.org/wiki/Dollar_cost_averaging