Well, it’s tactical problem.
For example, if you make table editor like excel, you provide toolset that gives full workflow cycle - for example, setting rows height, columns width etc (not like in revit, where they made one then next year - another)
If somewhere is ability to split in a parts something, there should be ability to join it.
So, that issue concerns collections in 2.8)
It is common layer system with ability to set an infinite amount of collections, released without proper management toolset providen.
I described most of such problems in Layer Maniphest some time ago, based on my experience, so there is need in subset of common tools that provide comfortable work with thousands collections.
Some of tools there can be pretty much simple, but this entire subset yet have to be designed.
Otherwise it will be yet another set of addons that again provides abilities that have to be basic, I want to avoid it this time.