Earlier quoted context omitted.
If the handle is metal, why would it ever need to be replaced? It's not going to rot, and it's not going to break.
It’s not that the handle is going to rot, it’s that there’s zero shock absorption. The fact that it doesn’t have a replaceable handle probably means that it’s for ceremonial purposes, not fighting. Hitting another sword with it would be exhausting and painful.
This kind of sword would not have been used like a hammer.
The wavy pattern on the bronze handle would have ensured a firm grip even with a sweaty or wet hand. I have some Japanese Tojiro kitchen knives, which have stainless steel handles with a similar pattern on the handle, and they are more comfortable than most of the knife handles made of wood or plastic, especially when used with a dirty hand.
So based on this experience, I do not believe that such a bronze handle would have been a serious disadvantage, even if it is possible that the sword was purely ceremonial.