... This can be a decent and reliable strategy. Buying at lump sum creates a risk on your capital, so buying gradually is a better trading strategy.
What you are writing about is called DCA (Dollar-Cost Averaging), and this strategy is completely unsuitable for trading, as it is the best tool for an investor. And this is due to the fact that trading requires a trader to react immediately to market changes, while an investor using DCA buys coins regardless of its value in equal installments after an equal period of time.
I don't think he understands the concept of investing and trading. They're two different things. You're right that we need to take action when there's an opportunity or when changes occur at the macro and micro levels.
DCA is an accumulation strategy implemented with a predetermined amount of money and time, not a trading strategy, where we speculate using technical analysis, sentiment, news, and fundamentals.