It's true, it's also how we use Bitcoin in the past. Pay with Bitcoin in places that accept Bitcoin or hoard it as an investment.
The truth is that many people have gotten rich by hoarding Bitcoins in the past.
If people got rich by hoarding in the past then we just follow the same thing, we are hoarding bitcoin now then 5 or 10 years from now to be rich, but I'm sure few people dare to do this, most people will always say its too late and no dare to take risks.
The reason is true, but it has nothing to do with the risk of buying at a high price. Currently the price of bitcoin is so high that the price cannot be reached by most people. I'm sure there are many people who want to invest in bitcoin but are financially constrained and they end up only collecting bitcoins from bounties and airdrops.