I have to dispute your dispute, I wonder if you might be doing it wrong? I thought the same thing until I tried precisely following the rice cooking instructions for instant pot. You have to use a lot less water in the instant pot that you would in a rice cooker because it's not loosing water to steam.

To me there is no contest, instant pot is a much better rice cooker - faster, more energy efficient and most importantly better texture. We got rid of our rice cooker once we figured that out.

I remember in Jiro Dreams of Sushi they use an ad-hoc pressure cooker to make the rice, so I think there really might be something to cooking rice under pressure that improves it.

Haven't tried the pot-in-pot method yet, but that's meant to be even better.