After watching Roy's video, I would like to ask... In what does Marth excels that Roy doesn't? What differentiates them? I see Roy was given a spike now, too, and a good aerial play, which were Marth's things.
Roy's Down-Aerial isn't a spike, it is a meteor. He also had one in Melee, although his combo game didn't really facilitate landing it. Of note, Marth is floatier (suffers less from combos). His ground speed and ground to air speeds are also notably higher, making Roy worse at positioning by a relevant margin. And of course, because of the differing sweetspot systems, Roy has to commit further to his attacks than Marth does. That hasn't changed.