And same like your friend there are so many like him who are aslo expecting the price to fall back at 24-26k before they actually buy because they feel and act greedy by thinking that if they buy it at the actually price now they would be at the loss but like you said no one knows how the price is going to be and hopefully the price might go down as they speculate but the chances of that happening is also two sided because the price rate can either continue to pump leaving you to either procrastinate more or buy at an even higher price. Sometimes most newbie who are eager to buy after acquiring little knowledge on bitcoin investment are the ones who are mostly victims to such actions.
I don't see that kind of strategy as being greedy; sometimes the person might not be too sure of what will come next in Bitcoin price, and as such, they will just try to play it safe in order not to fall victim to losing, not knowing that the same fear that they don't want to lose their invested capital could also make them not realize the profit they could have possibly made. The Bitcoin investment is always two-way.
But to me, the safest way to make such a buying plan in a situation where one doesn't know what's to come next in price is to share the amount that has been set aside for the Bitcoin buying purpose and use half of it to purchase at the current price, leaving the other half to be used hopefully when the price drops to their expected amount, so that if the price of Bitcoin is to skyrocket, they will not completely regret their action and will not completely regret their action. They will have a little holdings that they can take a small profit from. If the price also drops as they predict, they can buy more and add to what they have accumulated earlier.