I think diamond pipes distribute precisely too. Back in the EE2 days I had an all-BC piping system to autocraft dark matter and red matter just for fun. I had aeternalis and diamonds and all that jazz being split up in very strange ratios, and never once did I see a single excess item show up anywhere in the system.True, but even Diamond Pipes will only distribute items roughly, with the same fuzzy imprecision you get at any BC Transport Pipe intersection. The advantage with Diamond Pipes is you can set up distributions other than 50/50 (e.g. by putting two Cobble in one row and one Cobble in another, you'll get a rough 66/33 split).
I suppose things could have changed since then, but that would strike me as a very strange and uncalled for nerf...