Why add more functions to the settings that are unnecessary? You even said it yourself that you didn't know you can place on hold in reverse. The hold function is an additional step that is required to put the car in hold, it doesn't automatically put the car in hold.
If you don't have a need to place the car in hold in reverse, don't do it. There are already enough options on the settings menu, I don't need more options for a function that already needs to be actively engaged.
Yes, as I wrote, I don't ever put the car in hold in reverse and haven't come across a time where I've needed to put it in hold in reverse. Or any other car I've driven before this one for that matter. And because of that, I'm trying find out when this action would be used. @hacer provided an example where it can be helpful, which sheds some light on things. The option to disable hold in reverse might help someone like OP who keeps having problems figuring out what gear he's in. A car like this is infinitely customizable and in the future there are going to be options for things that you want and options for things that you don't want. That's the beauty of it. Just because some people have no use for certain things doesn't mean they shouldn't implement them.