Would this do any good for laserdisc captures? (i.e. the neglected, unaltered version of Millennial Garbage Movie '98)
Yes, stacking frames can really help with laserdisc and VHS captures, it can get rid of player-induced noise, and if you have multiple discs, then it can help remove dropouts and pressing errors, while reducing the chroma noise etc.
I’ve got an opposite question - if you have a grainy DVD and a Blu-ray so degrained that it looks too cartoony, is there a way to combine the HD image with the grain from the DVD?