Yeah, well that only means that people will build one block animal singularities which, let me tell you, puts a lot of strain on the server due to a high count of collision checks.I believe while it does address the issue of mob counting you cant get extra counts. The sewage collector at least from what Ive read into on the new version shuts down if it finds another active collector in its range.
I personally believe that collectors shouldn't be upgradeable, should come with a 3x3 collection area naturally and should produce a multiblock entity which keeps count of animals in its whole area. They should also share the tank.
Perfect.