To those who advocate for two-racket tennis:
Are you trying to encourage this as a competition, or just a form of exercise?
I'll confess that I don't really get it. To me, you could just use one racket but hit a left handed, and right handed forehand, by switching hands. It seems like holding two racquets is unwieldy, and forces changes in traditional tennis strokes because you can't use the off hand the same way. Sure, switching hands is kind of a hassle, but is nothing compared to the downside of using two racquets, which cause problems in feeding, picking up, and serving the ball.
But anyway, I do have a certain appreciation when people try new things, so best of luck to you.