It won't hurt at all. Usually the older rhizomes will eventually dry up and fade away much like iris rhizomes. It's probably a good idea to refresh the pot every few years or less.

My neighbor gave me a Begonia with overgrown rhizomes like that. I broke them up and put more space between the pieces when I repotted, and had enough for 2 larger pots. A few of the pieces didn't take but most have more spots where they're sprouting foliage now.