Part of human behavior is rounding things off to the nearest whole value. Something is either good or bad. Either wrong or right. While recognizing the utility of that approach and conceding it's often a good strategy, rationalists look for ways where resisting that very human tendency can help us out. I think this is most true when talking about an issue of policy that will affect millions/billions of people, like whether crypto should be encouraged or discouraged. That's the origin of the extra phraseology you're noticing in my opinion: to distinguish between supporting something, kind of supporting it, being bullish on it, being certain of it, being skeptical, being mildly skeptical, etc.
To my ear, saying "I'm still bullish" rather than "I'm less than infinitely certain about X" is the weird sounding one, like someone's trying really hard to signal to me they know and care about stocks and investments and stuff. To be honest I don't and still get confused on which is which between "bearish" and "bullish".