And that's exactly why blade cantrip sneak attacks aren't a problem.
Cantripper is making one bigger single attack.
Nicker is making two attacks, and has the option of picking up Dual-Wielder for 3rd.
The latter has the reliability (of landing their sneak attack in the first place) on their side, and can have a higher damage ceiling (if all attacks hit, if they have a buff on them/their weapons that gives extra damage on every hit), and can split their damage multiple ways in cases where their first hit was enough to drop a target.