Air carrier Captain reported not being able to properly communicate with EWR ATC due to nonstop talking on the radio after the facility had combined both Tower and Ground frequencies.

Narrative

We were flying the ILS approach to 22L. Low ceilings and low visibility required an ILS approach. We contacted EWR as instructed around the final approach fix. We were cleared to land after our initial contact. From this point on; there was constant radio communication occurring. EWR combined the Tower and Ground Control frequencies. Planes were calling up for pushback; for taxi from the Ramp area; asking their taxi sequence. Tower was issuing complex taxi instructions to multiple airplanes. ATC was talking nonstop throughout our entire approach. To say this was a distraction is an understatement. It was challenging to communicate in the cockpit because of all the radio communication taking place. It was borderline unsafe. It would have IMPOSSIBLE for us to communicate with the Tower Controller had we needed to.Cause: ATC combining Ground Control and Tower frequencies into the Tower frequency.Suggestions: Busy airports like EWR should not be allowed to combine frequencies. We are required to maintain a sterile cockpit environment below 10;000 feet. But somehow it is okay for EWR to combine frequencies and have nonstop radio communications while we are conducting a complex approach. This is asinine and should never be allowed.