I actually use Node for writing tools way more than other options because of how drama-free NPM is.
On the projects (such as Electron apps) where I'm forced to use NPM, it just feels icky to watch the thousands of sub-dependencies flowing in, crapping up my project.
So for a green-field project, which this thing seems to target, it would require installing NPM just for this thing. And then I'd need to figure out how to uninstall it cleanly without wrecking the project.
But give me a single .html and .css file that I can add to a new project and yeah, this seems cool.
There is a lot of upside/downside to NPM/Node, largly covered by smart people on the internet. The real question is "is NPM the simple solution to do X ?". And sometimes the answer is just "no, because it's over engineering the stuff".
The more I work in web development, the more I think we forgot the KISS rule to fancy tools.
I did WordPress based work a few years ago but I can't see any realistic way I could be doing that now and making any reasonable amount of money, because the reality is that just about anyone can do it, and if a company is going to pay a developer they'd rather pay them to develop something better suited to what they're doing.