A very dumb question which is not so dumb

[eisprinzessin]

Does Blade Arc use Attack or Caster Speed?

Forcewave […] is a path dmg type skill and is treated like a spell.

It’s a by-product of the way the system was originally set up, where it goes by the skill type instead of whether or not a weapon is used. So a path skill, like Forcewave, the system sees as a skill that is cast. Forcewave is kind of in the gray area since it is basically a cast skill that we decided to give a shield attack animation and %weapon damage too… so it results in the system not meeting player expectations. […]

Forcewave (when used with Tremor) is the reason, why you often see 2 handed melee weapons with cast speed.

Forcewave and similar item skills are the only outliers for a weapon attack.