Stable currency is very important as a backup. Always keep some stable currency in the wallet. I recommend you to hold only BUSD and also usdt, they are very good coins among stablecoins.Stable currencies play a role in bear markets. Usually traders invest all their currency, but later find that when the market goes down, they have no currency left to buy.So stablecoins are very important to cover losses in trading. I always secure assets in stablecoins,because I know it will come in handy in times of danger.
Stablecoins are only used for backup when investment or trading plans must eventually change due to unfavorable market conditions.
Some people certainly do what you say to anticipate the panic that occurs in the market. but indeed some people prefer to collect trading profits or investments made in the form of stable assets.
I do day trading. and every day when I will exit the trade then I will convert it into coin stable. and will do it again when tomorrow I start trading again.