Your goals are worthwhile. I recently built a tool not unlike yours, sharing many of the same goals vis-à-vis ease of use. Unfortunately it's currently closed source, but hopefully it'll be opened up soon and we can compare notes. There is definitely space for tooling which trade flexibility for ease of use. I wouldn't worry too much about Domenic's flame bait anyway, he has a habit of missing the point. (I mean, he did champion JS promises after all..)
"Bublé is so funny. Remember Babel started out as "Traceur output is too complex!" Over time they learned that being spec-compliant matters." — Domenic Denicola (@dominic, Editor of the @htmlstandard and @streamstandard. Works on @googlechrome.)
That seems like a biased description. Being lightweight doesn't seem to be a goal. The goal is having a very clear function with no configuration, and being simpler is just for brownie points.
Then it's worthless to say "Babel is spec compliant" when it is just compiler infrastructure and not a compiler. It can be as spec compliant (or not) as you want.