The "coin" in "Bitcoin" comes with a reason indeed. This is necessary to keep the system distributed and not centralized in any way. To continue with my analogy, there are ways to convert 500 small coins into 1 big coin, but you will have to bear the price of this operation. And in the future, there are many payment systems that can develop over the Bitcoin "layer" to remove the burden of actually moving money, at the cost of centralization and "money as debt". I could write 1000 more lines on the subject but it would go off-topic, this forum is full of other topics for that.