Because, like I said, fanedits are non-profit anyway. Whether I like it or not, the technology still exists, and finding a convincing soundalike isn’t always the easiest answer if you don’t know where to look or have the money to hire said actors. No need to get all aggro about it.
That is a good summation of what TROS is about, though. And it is better to focus more on making Leia’s lightsaber something with meaning to her & Rey’s character, rather than making it part of a different, third vision.