Both are true.
Even all top tiers without conquerors (like admirals for example) are haki masters with advanced armament and likely advanced observation. Without that, admirals would be like Enel and cap out at commander level.
We are so far into the story, so it makes sense that mythical DFs are popping out more.
This reminds me of the argument people were making against Conqueror's haki that only one in millions have it. That's still true, just that we come to see more of them since we are getting closer to the end, characters who reach that stage will be more likely to have it.
Even all top tiers without conquerors (like admirals for example) are haki masters with advanced armament and likely advanced observation. Without that, admirals would be like Enel and cap out at commander level.
We are so far into the story, so it makes sense that mythical DFs are popping out more.
This reminds me of the argument people were making against Conqueror's haki that only one in millions have it. That's still true, just that we come to see more of them since we are getting closer to the end, characters who reach that stage will be more likely to have it.