As with everything else, it depends where and how you want to use it.
Is Bitcoin better than fiat for daily use? Nope and nope. Buy bread and butter with Bitcoin, or make your grandparents do it.
Is Bitcoin better than fiat as a store of value? Definitely yes.
Is Bitcoin better than gold as an investment? Currently, yes. In the future, maybe.
And so on, depending on the use case.
I totally agree with you. the thing still for me which is limiting Bitcoin as the ultimate Currency is just that Daily user case limitation. We are not even close to that at the moment even in well-developed Nations let alone places where the knowledge is very minimal. But for every other thing, I believe that Bitcoin is great with, Store of Value and Fund transfers are best with Bitcoin. So as you said, I too don't believe that it can be wrapped up in one go but can be seen in the bits section where Bitcoin is better than Fiat.