I was told at one time the thinner wire plugs were designed for ignitions that had a weak spark signal. It takes alot less to fire a spark on smaller electrode than a larger electrode.

That's not what they were designed for.
It's the fact that a small area (or pointed tip for that matter) allows a spark to form with less energy required, so they're useful in ANY ignition.
Any time you reduce the energy requirements to make a spark, you get a more powerful spark.
It also doesn't make the spark smaller in diameter, nor does a larger electrode make a bigger diameter spark, if that's what you're thinking.