The Canon, Nikon DSLR, and Sony E-mount forums are partitioned APS-C/DX format and FF/FX format. OTOH, Nikon Z-mount, Canon R-mount, and Sony A-mount forums have both their smaller and larger formats included.
I'm not seeing the reasoning here, and I think there are good reasons not to do it this way. My D500 and D800 are a lot more alike than they are different from each other -- every lens I use on one can be used on the other, and the UI is very nearly the same on both cameras. If a Nikon D7000 series user asks me a question about their camera I would very likely have to look up the answer (the old DPR's camera database was often very helpful for that), and the same is true for a D600 user's questions. If I want to share some recent photos I took, and I used both my cameras, then should I put some photos in one forum and some in the other? Is the plan to further partition the Canon and Nikon mirrorless cameras as their user base grows?
I propose that each mount is consolidated into its own forum regardless of format.