Biggest abuse is probably on a rogue with warcaster and a friendly Dissonant Whispers or Commander's Strike.
But that doesn't really have much to do with summoned weapons.
I don't think Truestrike works with Commander's Strike
It does work with DW+Warcaster, but that is a lot of resources/design choices to make this available, so I would not call it abuse. To pull this off you need 2 feats on the Rogue or one feat plus a multiclass or Arcane Trickster and you need a high Int/Wis/Cha. Then someone in the party needs at least one Bard level or the Fey Touched feat.