It depends who and where you ask.
If you ask in a forum, on a marketing website, on Youtube or people giving out trading advice PDFs on websites, the answer’s pretty often that 1:2 (even 1:3!!) R is a really good idea. And that’s a really enormous number of people, so it’s obviously going to be a broad consensus of opinion, isn’t it?
On the other hand, if you ask anyone who’s ever made a living as a trader, or anyone who’s ever been involved in the industry in any capacity at all (far fewer people!), you’ll always hear the exact opposite.
It’s like everything else, when you’re trying to learn how to do something that so few people ever manage to do successfully: your own outcome will inevitably depend on whom you choose to listen to. 