My carry guns all have night sights. Even if the FO sights hold up in a scuffle (which they probably will), you won't be able to see them at night and having the option to have a sight picture without having to hold a flashlight in your support side hand, is invaluable. The group I shoot with shoots low-light/no-light quarterly and getting decent hit with tritium sights is much easier. I wouldn't have a carry gun w/out night sights.
That being said, all my competition guns have FO sights, but they also have a lot of features that I would never put on a carry gun, like a 2# trigger.
-The only easy day was yesterday
-If you are authorized to carry a weapon, and you walk outside without it, just say this to yourself... “Baa.”
-Bonvm certamen certavi, Cvrsvm consvmmavi, Fidem servavi