What's the logic behind Senna Q proccing literally anything?

It's an AOE spell, what part of "AOE spell" sounds like on-hit to you? or an auto attack? She can also clear wards and other similar objects with this thing, like GP Barrels. This makes literally 0 sense This spell is the only spell I know of that procs on-hits, spell-procs, is counted as an auto attack AND is AOE. Like what?
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