That's a rather disingenuous argument to try to 'prove' the blinking lights and cardboard sets wouldn't at all be an issue for modern audiences considering Marvel absolutely did not put the silver age tin can looking Iron man suit on screen, they said hell no to Captain America's old swashbuckler boots and the scaly mail shirt and reduced the silly wings sticking out of his helmet to decals (while also ditching the helmet entirely for most of his scenes), did their best to keep Thor from actually wearing his winged helmet and just flat out refused to use Hawkeye's comic book costume at all. Plus they entirely redesigned the Shield Helicarrier, rewrote Tony's backstory and altered his personality, tried to softball Asgard as technologically advanced aliens who merely call themselves gods, erased Thor's human identity entirely, tossed Tony's secret indentity out the window, merged multiple Iron Man villains into one guy, and completely redesigned the Chitauri. And that's just up to the first Avengers movie. They've continued making changes both major and minor ever since.
Anyone who thinks Marvel didn't go to a great deal of effort to properly adapt their decades old characters for modern audiences is just showing ignorance of what the source material was actually like.
The Avengers the movie is The Ultimates, which was a cool modern redo on the Avengers, that cast Sam Jackson as Nick Fury 4 years before the Iron Man did.