The RDLR is so important in modern grappling, and especially no-gi, because it allows you to maintain the distance and not be smashed. Rafa Mendes vs. Rodolfo Vieira nogi is a prime example and so are a lot of Keenan Cornelius' early matches against big guys like Rustam.
Last night at the Expo, Leandro Lo kept Jake Shields' weight completely on the ends of his feet and arms. it's so much easier on your body because you aren't having to pull someone's weight on top of you. There's a time and place for half guard, but in modern grappling RDLR is more difficult to pass. There aren't a ton of sweeping options from RDLR, but it's a great position that's very hard to pass if you know how to stay active and switch back and forth between DLR and RDLR.
You could argue that it's also not good on the body long term to invert and do that type of game, but if you watch the better DLR and RDLR players, they usually don't invert when their opponent's weight is on them. They usually are already mid sweep and there's not too much pressure on the spine/neck.
I'll post it here for good measure, but just pay attention that even though Rafa can't get a sweep or a back-take, Rodolfo is never able to cross Rafa's hip-line, and can't dominate any solid grips on the upper body or the lower body. Even if you try to secure over-unders or a darce or a guillotine in someone's RDLR you have to almost literally dive on it unless you can force your way past their RDLR hook into half guard or a knee cut.