There’s no explanation needed for a lack of response regarding Vader’s unmasked appearance. If ESB ended with Luke saying, “Sure. I’ll join up”, and then they go out for tea, then yes, some kind of reaction shot (I think a double take, followed by, “Bwaaaa?” would be best).
But his concern is entirely on his ailing/dying father at that point, not something superficial like his appearance.
I made this scene quite a few years ago and thought it was a cool concept. The fact that almost all of you have shown it nothing but vitriol in a thread designated to an alternate version of the SEs. You are all hypocrites and should be ashamed of yourselves for thinking that one idea is “superfluous” when the very idea of changing the original versions is something a lot of us see as blasphemy.
Everyone was perfectly nice to you. Especially for this site, and especially for anywhere on the internet. But I guess we’re done with that, now.