As sprung joints are great for clamping two edged boards together to make a panel, they are disastrous for non clamped rubbed joints. To avoid following the footsteps of magazine articles, I will not go into detail of what a rubbed or sprung joints are. I believe that you are well passed the novice stage and I don’t feel it would be beneficial in re reading something you already know, but would rather bring to your attention to something you may not have been aware of or unintentionally overlooked.
There has been a strong emphasis awarded to sprung joints, many articles and videos have been written and produced stressing the benefits of such a joint. While I don’t disagree with them, sometimes the obvious tends to skip us and we continue to apply a certain technique that has been drummed into our heads by an almost hypnotic suggestion through the continual parroting of others, that would lead to disastrous results if we were to apply the same technique using a different application. This issue I feel needs not be overlooked, but addressed in any future articles written on the subject.
The success of a rubbed joint is comprised of only two things, glue and two perfectly straight no gapped edges. A sprung joint as you know has a 32nd hollow in the middle, creating a successful rubbed joint would not be possible. The other point is the type of glue that best suit a rubbed joint would be hide glue. True, you could get away with small thin pieces using ordinary PVA or other quick setting PVA glue, but for a small cabinet or bedside table or even a coffee table, only hide glue in my opinion would be better suited for a such an application ie. rubbed joint. I have written in my previous posts on the benefits of hide glue so I won’t go into any great depth on the subject here, other than to add, only hide glue as far as I know, has the capabilities of drawing two mating edges together as it dries, forming a good solid join and for that to happen there cannot be any gaps.