Traders should stay focused on their asset by monitoring the fluctuations, because this helps them become updated with every changes. Having gains to stay in green signals is very difficult to maintain while market sometimes saturate due to resistance. Long term holds will be effective for a meanwhile so trying this as an alternative strategy might be efficient as well.
You just said something more important mate, there are traders in the industry that won't check on their portfolios until they deem fit to which is wrong indeed. Asset should be check regularly except the portfolio holder in question belong to the class of the whales. What i will advise every trader to exhibit is: be such that have a managerial skill in managing your portfolios, don't buy into the FOMO becasue the result always end in loss.