You want even cuts you throw it into a blender

Besides a dice that's as even as possible, the other requirement this solution attempts to satisfy is using the minimum number of cuts. A blender doesn't satisfy that, as it's making hundreds of cuts.

Then, when you present your solution to the client, you find out there was a third, unspoken requirement: that it should involve as little cleanup as possible, which the blender also doesn't satisfy. The user researcher was on vacation, and you didn't find out about this before beginning design. Damn!

The blender solution turns out to be overoptimized on a single requirement at the expense of the others.

Blender's not really well suited for dicing dry foods, they typically need some sort of liquid to bring the solids down to the blades.

Food processor might be more what you're thinking about but it's more so for dice or mince. You won't ever really get an even chop out of a processor.

That’s the engineering solution.

You could also hire two interns to do it layer by layer, call it the consultant‘s solution.

That’s really not true, unless you are really mincing it or making a paste .

A blender will make the bottom layer into paste before the top is touched. If you want to toss the paste into a skillet and caramelize it, that'll make a good sauce.

Food processor might be better, but still won't be even.

Source: I cook onions a lot, and am lazy. This article is great!

two words: Slap Chop.