The problem with "the right thing" is that it requires you to
actually know what the right thing is. Not have talked yourself into thinking it's the right thing, not having enthroned your prejudices with the "right thing" label. No, you have to actually be right about what "the right thing" is. In a world where no humans are omniscient, that's harder than people think. Everyone's sure that they're right about what the "right thing" is, but most are in fact mistaken.
In contrast, "worse is better" lets you throw something out there that's kind of in the right direction, and get feedback so that you can discover what "the right thing" (the thing that people actually need) is.