You are correct that Bitcoin has several advantages over other traditional fiat currencies, and one of them being cross border transaction fee which is much lower compared to using traditional banking channels for this purpose. In my view the key advantage of investing in Bitcoin and holding it for long term, is its unmatched returns which is evident from its track record of past 15 years since its inception, despite the fact that it is highly volatile asset.
In addition, we also need to mention that when using bitcoin, it ensures our privacy and helps us to be our own bank without having to depend on anyone. If talking about the utility of bitcoin in life, what I like most is the privacy it brings, I feel safe when my main asset is bitcoin, and only I have access and control.
As for investment, it is true that we will get huge profits if we invest in bitcoin properly. But let's not forget the risks we face if we invest the wrong way or see it as a get-rich-quick strategy.