It's not just the person doing it, it's the blade itself and everyone on Roshar(Hundreds of millions, if not already in the billions),and on top of that, you can't even have people think of it as two peices of the same whole, but as two completly different blades, otherwise you will have the same result you get when trying to repair different peices of Shardplate, where only one is fixed and the other crumbles to dust.
To put this in percpective it takes more than fifty years for a rug to be considered part of a building, and Honorblades have been around for so much longer.