...fast-forward from then till now how Bitcoin has bounce back to it current price and is still climbing up,
those people that sold their holdings at a loss will be licking their wounds by now and thinking how they wish they hold on to it a little bit longer.
They can count their losses if they sold and market begins to rally up. What if they sold prior to bear season, they will be happier they did. It's a two way thing. It's either this or that when it comes to Bitcoin; and by extension, life. Nothing is really cast in stone. We shouldn't make it look like it's automatic profit once we invest in Bitcoin. Being in profit in it will depend on when one buys. Anyone buying Bitcoin now is more likely getting into profit than into loss.
Monitoring the price of your holding everyday will earn you nothing, but since we are all humans, it will makes us want to react to some price changes which is not good for the goal of getting filthy rich in the crypto space.
Most times, what watching screen does is getting into our emotions and messing the whole thing up as we panic and sell off prematurely when we have correction, thinking it's a change in trend.