There is no loss in bitcoin investment unless you don’t have a proper entry and exit plan to your bitcoin investment. For one that has invested in bitcoin at a lower price and sold at an higher price cannot face loss. Those that fall in this dilemma are mostly selling out of panic due to fall in price. If you as an investor stick to your plan of taking profit at a targeted price, you don’t have a problem of selling at loss because if your goal hasn’t being achieved, you won’t be pushed to sell no matter the condition of the market. Set the rule, stick to the rule, don’t pay attention to FOMO/FUD, and you’ll have a profitable investment in bitcoin.
I think op was even targeting the day traders because I was wondering why an actual investor would be worried over a loss they are certain would be recovered when the price finally gets back up because in as much as bitcoin isn't falling down to zero, I don't think an investor would be liquidated as liquidation is mostly common in trading and not just holding.
I have to agree with you that, as an investor, we should have a target price to sell our coin and as long as the price isn't reached, it is advised we keep holding and this thing is what many investors don't know how to do as they're all focused on not selling and making it seem like selling is wrong,
so it is advised to seek opportunities to buy low and sell high when you see the chance.