it involves buying a smaller amount of crypto every week or month no matter what the market is doing.
I think I like this. This is an investment advise and attitude to be adopted. Cryptocurrency is actually an umbrella for mortgage and saving of our financial. On another broader look it can be like staking for future gain because if we have our coins with us it plays the role of saving of our finance and staking of our coins right there in the wallet. So this is a good advise to grow income.
It is a good advice in the sense that it removes all psychology from the act of buying/selling. Many people trade based on emotions and buy high or sell low, this can be avoided with such a strategy. One should keep in mind however, that crypto as asset is quite new and nobody knows if it still will be around 10 or 20 years from now. Also many Alts that were popular a couple of years ago now trade for almost zero. So one should pick good coins and adapt the strategy of which coins to buy from time to time.