I know Chinese harvest their rice up to three times a year. I don't see how perennial rice could compete.

Harvesting normal rice is just grabbing entire plants, as many as you can grab at a time. I may know nothing about how harvesting perennial rice is supposed to work, but I grew up as a farmer and I have imagination. You have to leave some part of the plant for it to keep growing crop which means you can't just grab it all. And I think this is a deal breaker.

It just does not make sense to get even more labour intensive plant at a time where labour in all parts of the world that grow rice becomes suddenly so much more expensive.

So until they figure out to build robots that can individually pick rice grains off of a tiny, fragile rice plant, I am not seeing any future for perennial rice.