Yeah, chromed bores aint important anymore, and its been found by target shooters that chromed bores are in some ways slightly less accurate than non chrome lined bores, I can imagine why in some laymans' way of figuring, but that is what is supposed to be true for some reason or another.
Stainless is supposedly a little harder than regular moly steel, so one could say that for my a2 stainless 5.45 upper that its good enough if I worried about wear resistance.
Besides, the way I see it, I believe most regular shooters don't wear out their bores merely shooting sheer numbers of rounds, chromed or otherwise, but damage them due to poor cleaning techniques damaging the rifling fore or aft, faulty ammunition that was either reloaded or loaded impoperly, lack of cleaning that collects damaging moisture, etc all long before any wear is noticeable, especially on the smaller calibers like .22 and 5.56 due to the size of the cleaning rods. I've even noticed one dealer giving away a free military surplus steel section cleaning rod/kit with every purchase of an ar15, which is why I noticed a damaged muzzle crown with a powerful bore light on at least three of his used ar15's he got back from customers on trade ins, that's the voice of experience there from when I was in the army years ago where we were made to clean our rifles too much and I watched the accuracy of my ma16a1 dwindle more everytime the commander wanted to instill rifle care with overcleaning of the bores, I swear my m16 got rebuilt twice, maybe three times, within a two year period, and I'd go from expert to basic marksman then get one of the new loaner rifles to qualify when I couldn't even make marksman, only to qualify with the newish loaner that was cleaned only by the armoror. I don't use bore guides still, but I do use brass cleaning rods "with care" generally from the breech end only.
You know, I've even thrown away m16 surplus "bore brushes", the ones with the steel wire locking lug brush mixed with bronze bore brush, thats a little too harsh for civilian locking lug use, if you really think about it for awhile, I mean, nobody would want to take a steel wire brush to their fine bolt hunting rifle locking lugs, etc, and maybe if someone has an accuracy issue with their ar15 then I wonder if they also have religiously scratched up/worn their chamber area or locking lug recesses over time with these surplus or otherwise ar15 bore/chamber brushes, save those for a combat situation, now shooting a rifle you had to buy yourself and not issued to you by the military for instance. I KNOW a friend did wear his bushmaster this way, he'd practically white glove his own chamber even if he only shot one mag full, ending up with strange bolt sticking/headspace like malfunctions, that area looked "wire brushed" and worn.