I am not speaking about just Bitcoin. I am speaking about every cryptocurrency / token. Regardless of crypto price fluctuations, many online and offline stores are ready to accept crypto as payment. So How will willing are you to spend crypto for your purchases?
If one doesn't spend their crypto for purchases and wait for to spend their crypto when its price is nice, are they really considering it as a cryptocurrency or can we assume like those people are treating more like a security or investment instrument?
When the market get down that means most of the investors will loss by their investment. I think if one is not overwhelmed with big financial problems, then no one will want to sell if the market is down. However, if someone is purchased by crypto currency and is profitable, if he thinks it is good for him to take the profit in this case I think it should be sold. However, there are big differences between investing in other altcoins and Bitcoin. If anyone holds a bitcoin, it is best not to sell it because the price will rise at any time. Which may not be the same with others.
Spending crypto when the market is down is not a wise choice at all, especially if what we hold is bitcoin. Except as what you said, when we have financial difficulties that require us to spend the assets we hold, it's a different story. But when things are fine, we have to keep holding on and hold on until the market goes up again. I actually think the opposite, if the market goes down it is an opportunity for us to hold more, or in other words we make purchases.