I've played with a lot of people (e.g. RenderingStar, Panicitstylor and Tenryuga) who can also do these advanced combos online if the connection is decent (in my case it was always 1 bar to them). Sure, sometimes they drop them, but that happens to me even with easier juggles. Therefore, I wouldn't say it's not necessarily.
Of course, we are different in this point. I have no offline scene around, so I'm nearly always playing online and cannot say that I would play her "in a other way" then. I'm always playing her the same way, just trying to improve some things with time. In addition, I'm sure you are more anxious like me for optimizing your way of playing, since you are participating in tournaments for example. Please don't get me wrong, that's not meant offensive. I admire you guys for your anxiety, but I don't take it as seriously as you do. Therefore, no worries, I won't stress it.