Here's my own personal anecdote. I actually have been more prone to spend during rally periods than downswings or periods of stability.
Yup, use purchasing power when it looks like it's the best it will be for a while.
There are all sorts of psychological effects from hard currency, I tend to concentrate on never buying somehting useless that won't last (although I tended towards that with fiat, but giving up BTC just has to be a more careful decision). I think cryptocurrency will eventually remove the designed obsolescence from manufactured goods. The fiat system encourages such waste of time, effort and raw materials. When I was a boy, before The War.... etc
^^ This
unfortunatly a lot of economists are still confusing massive trash production with good economic groth
Inflationary economy = You have to spend or you lose, no choice = A lot of STUPID investments
Deflationary economy = You are not forced to do anything with your money = A lot of SMART investments (people will not waste their money needlesly on stupid ideas because they can earn just by holding them)