We just upgraded to a 2023 B52 (stock FAE) from a 2008 Tigé (no FAE). It’s doable without, but you’ll be glad you have it once you have the FAE. No more headaches after surfing.
It isn't necessary, but it is a significant upgrade. Reduces noise behind the boat a LOT, inside the boat a noticeable amount, and obviously reduces exhaust for the surfer. That said, we surfed behind our 2016 without one for two years and it was fine.