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You're right, trading and Bitcoin investment are different things but some investors misunderstand the both concepts that's why they trade with Bitcoin and see it as another form of accumulating to their portfolio. However trading is a very risky way of investment that involves short-term goals while Bitcoin investment deals with longitivity, you'll have to invest over time and periodically to become a successful Bitcoin investor.
Each investor's investment time frame is different, and you will even find that they set different goals for their investment.
Some investors are those who expect returns from their investments in the short term, while others expect returns from their investments in the long term. You'll also find them just taking advantage of bullish seasons, while others continue to accumulate for years.
I can also say that some investors are those who have chosen bitcoin as a store of value asset, long-term investment, retirement investment or something like that. They don't care about short-term volatility and continue to build their portfolios over time, so these different goals will make them act differently.
I having a source of income and then taking your Bitcoin investment as one's retirement investment is a good one, it will help one focus more and become consistent without minding Bitcoin volatility since he or she will be holding for a very long time.
Bitcoin investment is something that will take a very long time to grow into something huge and anyone coming into Bitcoin investment should see it as a retirement investment or a long time investment goal with such mindset it will help one to have a direction which he or she wants with Bitcoin.