I really find it hard to believe that people are divided into 2 categories. You're trying to say that some people just want more bitcoin, but they're not worried at all about its value in fiat? It's always nice to get more Bitcoin, but it is critical to pay attention to the exchange rates. You want to buy low, hoping that the value will increase over time. Since our world most works on fiat still, it's very important to pay attention to the dollar value of your crypto.
Yup that's true, there's many countries that banned bitcoin as their payments so people need to change their bitcoin first to dollar/other FIAT. If you're worried about your dollar value on your bitcoin because you buy high and now it's low price then just hold till the price increase again, you will lose nothing if you keep your bitcoin on your wallet.