i mean...
there's truth to that statement for sure. but like, tritium sights provide a good long while's worth of lume. a decade or more? sure they fade over time. but if the *half-life* is 11 years, then isn't it reasonable to believe after a decade, you'd still have half the luminosity than when you did when the sights were new? and they are pretty bright when they're new.
anyhow my point being is, yes training is key. i got a good deal on my glock night sights (about 60 bucks). how many rounds does 60 bucks buy? about 300?
can you learn to shoot at night with 300 rounds? see in the dark with 300 rounds?
i tried shooting my new (plain sight) 1911 on a range at night. i couldn't see anything. i couldn't see the target - just barely an outline under moonlight. and i couldn't see my sights at all. couldn't see my gun at all. it just didn't seem like a good idea.
there are a lot of bells and whistles that you can get for any firearm, and i'm all about simplicity. i don't have any gee-whiz stuff on any of my firearms, nor do i ever care for it. but of all the things i'd "splurge" on it'd be night sights. they are the bees knees.
and only 60 bucks or so why not? beats those stupid laser sights, or glass breaking tips, or bayonets or strobing flashlights or whatever.