The thread ended here.Yes, I have a very ancient and out of date FAQ there.
Also, saying rolling is a "bad habit" because poor players frequently do it too much is like saying that smashing (as opposed to using tilts) is a "bad habit". It's true that most poor players should smash less and tilt more, but we would never tell them to stop using smashes altogether. Rolls are kinda the same way. It's a very valuable defensive option I strongly feel you would be foolish to neglect. It's just that, like all things in this game, it has to be used in moderation, and you have to be good at recognizing when an option is working and when it isn't.
Rolling is good when used properly, which is mainly defensively and occasionally for offense.
Spotdodging can be punishable in many circumstances, but in general you're not going to punish a backwards-roll unless you're like Snake or Falco or Lucario or something.
Ignoring it completely is foolhardy and is just limiting yourself.