Ah. So it really is similar to the base I got. Though it has rails along the edges while the one I have just has the grips at the sides of the support rails. Though, if three grips on each side isn't keeping your bed (or support, rather) in place, you've got bigger problems than your bed shifting. Though, it's not going to stop the mattress from shifting out of alignment with the support unless the edges rise up higher than the support does, and if that's your issue, you need a proper platform bed frame, not a frame designed to work with a support like that.I have one of those for a Cal-King. Basically it's a fixed frame with center support and higher side rails. It holds and supports the mattress box(es) much better than the cheaper adjustable ones. So if you jump in the bed, it's much less likely to shift at the frame. Downside is you're restricted to a mattress size that matches the frame, and they cost quite a bit more.
My base isn't much more 'real' than that thing, but it cost half the price and looks to be sturdier and more stable. I only really cared about it not having an under the bed access so I didn't have to worry about dealing with it.$314, yikes. At that price, why not buy "real" furniture?
So, what, do you go to another bed entirely when it's time for cuddling or sexy times?But if you have your optimized half, you wouldn't want to stray over to the other side anyways.
Seems to me that if you have to have a topper of some sort just to deal with the issue of the beds not matching up, you've pretty much destroyed the utility of having separate mattresses in the first place. Not to mention getting separate toppers would seem to be the better approach to ensuring the comfort level is appropriate for each person.
As for why it might be obvoious: I've never been in a situation where the bed was great for one of us and lousy for the other... It would never even occur to me that it might be a thing, and as mentioned above, that seems to be a thing for a topper to correct, not an entirely new set of mattresses.