If you buy now a good coin/project, than I can sign under HODL is advisable!
But HODL/Investment in shitcoin is probably never advisable...
On the other hand HODL at the wrong moment, it doesnt matter whether it is good coin or shitcoin, is not advisable. For example in Dec 2017... But you need to understand, that whoever is hodling for a really long periods, for example from 2012, is doing great, despite all ups and downs...
As you said, the problem is the timeframe you want to HODL. People doesn't understand the economics concepts behind cryptocurrencies, coins are mostly scams and you take you money from you. The only coin that you thrive is bitcoin, but you can hold securities tokens as you wish, but remember that it is not a coin.