We have 2x25 plus 2x10.
The tens are sufficient for 90% of the hookups. Occasionally use a 25 when the hose bib is further away. Used all 4 just once in Colorado when one pedestal was shared by two back-to-back sites and was far away. Also, many public campgrounds only have a few water faucets scattered around the campground. It's nice to be able to refill your tank by stretching hose instead of moving the rig to the faucet.
Even in a site with city water we fill the tank. Too many times the park shut down the water system for maintenance half a day, and one time overnight. We were glad we took the time to fill the fresh tank.