All I'll say is if you can use an RO sander in an area where you'll leave a flat surface, then it can be a good help. However, if you're using to trying to remove old varnish where you may tend to cup the surface, or on profiles you'll damage with agressive sanding, you'll damage the wood.

Having said this, I'll use a 6" RO sander on large flat areas after removing old varnish with a heat gun, the take the last of varnish layer off. But I use it as a flattening tool keeping a flat and even motion.

But for the most part, I avoid much sanding at all when I remove varnish(I use a heat gun and scraper, it's the easiest for me) or between coats. I only take it down to 150 grit or so before I begin filling the wood with thinned coats. Then I'll use 220 between full coats. I might use 320 between the last couple coats but usually don't go beyond 220.

I think one key to brightwork is leave the surface flatter than you found it. This goes for taking off old varnish through applying your last coat. It will last longer if it's flat, and it's the least amount of work.