There is more feedback gained from public testing than can ever be gained from inhouse testing. The sheer amount of PC configs alone would make public testing worthwhile.
But that depends on the type of feedback you're after.
They can get enough detail on client/server performance by just running the Metro map, and I imagine they are currently having issues on console with the large maps and/or jets, therefore they don't want to release that into the wild yet as they do not want to put off potential buyers on console with a buggy product.