I don't know where you're looking, but if you go to the first result for trick-down economics, the Wikipedia page, within the first few lines it mentions how the term is used, and how it was created by detractors of supply-side economics. It's never been a real policy.

    "the term 'trickle-down economics' was popularized by Democrats in the US to derogate Reaganomics"

If you similarly look up supply-side economics, at the top of the Wikipedia page it says

    "not to be confused with trickle-down economics"

I'll happily take you on your word that you're not trying be argumentative. It's certainly not your fault that this strawman has been so widely spread that people think it's a real policy idea now. It is confusing to me too.

As for whether supply-side economics actually works, to say it "hasn't panned out" I think, is really oversimplifying. Has capitalism (efficient markets but also environmental decay) worked? Has socialism (universal healthcare but also the military) worked? It depends on who your asking and in what regard. In some ways yes and in other ways no. The category is too broad.

Also, just as important as how much we tax is where we tax. Carbon tax (very good) vs stamp duty tax (very bad). Competent policy often allows you to have your cake (supporting government services) and eat it too (not sacrificing growth).