Iron sights, what are iron sights, can't find them on any new hunting rifles worth their salt.
While many, if not most modern sporters no longer come with iron sights as standard, there are still many "worth their salt" that do. Especially in the bigger, shorter ranged calibers. I don't recall seeing a .375 H&H or a .458 WinMag without irons as standard.
Its a matter of the market, more than actual utility. I recall the years when the "regular" bolt guns came with iron sights as standard, even though they were also factory drilled and tapped for scopes.
Scopes are the preferred option for most rifles today, from varmints to big game. Rifles designed before the era of decent scopes (including all the classic leverguns) still wear the iron sights of their era, standard. Dangerous game rifles always have irons on them.
I don't think all airplanes need propellors, and I'm a big fan of automatic transmissions, but note that even today, cars still have emergency brakes. And like e-brakes, you should learn how to use them correctly. Then, enjoy driving anyway you like.
If your scope packs it in (permanently or just temporarily), having irons on the gun means you are not done hunting, unless you want to be.
Combat, however is different, and I don't think any combat weapon without some kind of iron sights (even crude emergency back up ones) is properly outfitted for maximun utility. And that lack can be serious when all else fails.