Bumping this separate from the other thread as having the ability to -1 ranges here, or having a way to combine multiple, arbitrarily-lengthed, fluid.dataset~s in a more general way (ala merge, which seems like a quite niche use case) would be super useful now that you no longer need to be so explicit with decisions further up the analysis chain.
Also, these threads/bumps are essentially from the friction I encountered patching stuff where I got things working super nicely, hand-picking descriptors and stats, and then having to slam the breaks and switch back to “oldschool FluCoMa” coding to combine things and carry on with the process. So the elegance of the “newschool” stuff seems to drop off at a certain point of the processing chain.