i wouldn't really introduce this as "a problem solver" :) It's more like an exploration of an alternative approach that combines base concepts such as:
But if I have to pick my brain and find a benefit that this approach brings, i guess it would be that we now avoid the entire "config hell" and cognitive load of managing build setups. This article shares some of this view: https://deno.com/blog/node-config-hell
Disclaimer: i have nothing against standard build processes that we've used for years. I've juggled a lot with browserify, webpack, and their successors & siblings. I just feel it's worthy to give a spotlight for an approach where we completely go without them :)