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When an individual end up investing into Bitcoin with money they really need for necessary expenses like rent, food or emergencies, every short term price movement can force them to sell at a loss. So I think it's not just about holding your Bitcoin for long term, but also about knowing your financial capacity before investing.
It's important that a person understands their priorities when putting their money into Bitcoin. If they know their money is tight and they have more needs to take care of, then they can invest only a little of what they can afford --- they don't need to force themselves to invest when there are plenty of things that need to be handled first.
It's more important to take care of your needs first, and then you can think about investing. Investing should only be done when you are truly able to do so, otherwise, you may end up selling your Bitcoin too easily, which prevents you from fully maximizing your investment.