What OP means by "smart holding" is we have to stay alert on checking the price of the altcoins we have for us not to miss the chance to sell it on the price that we want to earn profits and "just holding" means you have no idea what you are doing, you are just hodling because it is what the majority does, you are just waiting for the bull run even you could make profits while waiting for that one.
makes no sense if you hodl and dont know anything on why you entered that business. the one you said about making profits while hodling/waiting, i think that is not what you call an investment but that is already a trading . hodling takes time to earn unlike to trading that you need to scout for the possible opurtunities to earn.
smart holding is still better than hodling alone due to the smart root word . it means that your working smarter